Level auxiliary conversion control circuit and level conversion circuit

Abstract

The invention relates to a level-assisted conversion control circuit and a level conversion circuit. The level-assisted conversion control circuit is applied to a negative voltage level conversion circuit. The level-assisted conversion control circuit is used to accelerate the level conversion time of the negative voltage level conversion circuit. The level-assisted conversion control circuit comprises a signal generating unit and a control unit. The signal generating unit generates a narrow pulse signal when the input signal level changes. Then, the control unit accelerates the disconnection of a slave control tube of a target conversion unit that is turned on at the last conversion moment according to the narrow pulse signal, thereby improving the driving capability of a master control tube in a switch to be turned on to a slave control tube, accelerating the turn-on speed of the switch to be turned on, and finally improving the conversion speed of the negative voltage level conversion circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a level-assisted conversion control circuit and a level conversion circuit. Background Art

[0002] The level conversion circuit is used to realize the level conversion between two different power domains. The level conversion circuit includes a positive voltage level conversion circuit and a negative voltage level conversion circuit, wherein the negative voltage level conversion circuit is used to realize the conversion from positive voltage to negative voltage, and generally includes a positive voltage to positive voltage conversion circuit and a positive voltage to negative voltage conversion circuit.

[0003] When the input signal is changed to switch the conduction state of the switch pair, thereby switching the output state of the level conversion circuit, at the moment when the input signal level changes, the transistor in the switch pair to be turned on may not be driven immediately, thereby reducing the conversion speed of the conversion circuit. Summary of the invention

[0004] Based on this, it is necessary to provide a level-assisted conversion control circuit and a level conversion circuit that can improve the level conversion speed.

[0005] A level-assisted conversion control circuit is applied to a negative voltage level conversion circuit, wherein a first conversion unit and a second conversion unit of the negative voltage level conversion circuit respectively include two groups of switch pairs; in the same conversion unit, the drain of a master control tube of one switch pair is connected to the gate of a slave control tube, and is commonly connected with the drain of a slave control tube of another switch pair to serve as an output end of the conversion unit; a source of the slave control tube of the first conversion unit and a source of the master control tube of the second conversion unit are respectively connected to a first reference end, a source of the master control tube of the first conversion unit is connected to a second reference end, and a source of the slave control tube of the second conversion unit is connected to a third reference end; the level-assisted conversion control circuit comprises:

[0006] A signal generating unit, configured to receive an input signal and generate a pulse driving signal when a level of the input signal changes;

[0007] A control unit, connected to the gates of the target slave control tube of the signal generating unit and the target conversion unit, respectively, and used to disconnect the target slave control tube according to the pulse driving signal;

[0008] The target conversion unit includes at least one of the first conversion unit and the second conversion unit, and the target slave controller is a slave controller of the target conversion unit that is turned on at a previous conversion moment.

[0009] In one embodiment, the target conversion unit includes the first conversion unit, the target slave control includes a first target control, the pulse drive signal includes a first pulse signal and a second pulse signal, and the control unit includes:

[0010] A first switch unit is respectively connected to the signal generating unit, the first reference terminal, a gate of a first slave control tube of the first conversion unit, and a gate of a second slave control tube of the first conversion unit;

[0011] If the first slave control tube of the first conversion unit is the first target tube, the first switch unit enters a working state in response to the first pulse signal, and turns on a conductive path between the gate of the first slave control tube of the first conversion unit and the first reference terminal to disconnect the first slave control tube of the first conversion unit;

[0012] If the second slave control tube of the first conversion unit is the first target tube, the first switch unit enters the working state in response to the second pulse signal, and turns on the conductive path between the gate of the second slave control tube of the first conversion unit and the first reference end to disconnect the second slave control tube of the first conversion unit.

[0013] In one embodiment, the target conversion unit further includes the second conversion unit, the target slave control unit further includes a second target control unit, and the control unit further includes:

[0014] The second switch unit is connected to the gates of the first switch unit and the second target tube respectively. The first switch unit is also used to drive the second switch unit to disconnect the second target tube in the working state.

[0015] In one embodiment, the second switch unit is further connected to the third reference terminal, the gate of the first slave control tube of the second conversion unit, and the gate of the second slave control tube of the second conversion unit;

[0016] If the first slave control tube of the second conversion unit is the second target tube, the second switch unit is used to, under the drive of the first switch unit, conduct the conductive path between the gate of the first slave control tube of the second conversion unit and the third reference terminal to disconnect the first slave control tube of the second conversion unit;

[0017] If the second slave control tube of the second conversion unit is the second target tube, the second switch unit is used to turn on the conductive path between the gate of the second slave control tube of the second conversion unit and the third reference terminal under the drive of the first switch unit to disconnect the second slave control tube of the second conversion unit.

[0018] In one embodiment, the first switch unit includes a field effect transistor NM1, a field effect transistor NM2, a field effect transistor PM1, a field effect transistor PM2, a resistor R1 and a resistor R2;

[0019] The gate of the field effect transistor NM1 is used to receive the first pulse signal, the source of the field effect transistor NM1 is connected to the second reference end, and the drain of the field effect transistor NM1 is respectively connected to the first end of the resistor R1 and the gate of the field effect transistor PM1;

[0020] The gate of the field effect transistor NM2 is used to receive the second pulse signal, the source of the field effect transistor NM2 is connected to the second reference end, and the drain of the field effect transistor NM2 is respectively connected to the first end of the resistor R2 and the gate of the field effect transistor PM2;

[0021] The second end of the resistor R1, the second end of the resistor R2, the source of the field effect transistor PM1 and the source of the field effect transistor PM2 are connected to the first reference end;

[0022] The drain of the field effect transistor PM1 is connected to the gate of the first slave control transistor of the first conversion unit; the drain of the field effect transistor NM2 is connected to the gate of the second slave control transistor of the first conversion unit.

[0023] In one embodiment, the second switch unit includes a field effect transistor PM3, a field effect transistor PM4, a field effect transistor NM3, a field effect transistor NM4, a resistor R3 and a resistor R4;

[0024] The gate of the field effect transistor PM3 is connected to the gate of the field effect transistor PM1, and the drain of the field effect transistor PM3 is connected to the first end of the resistor R3 and the gate of the field effect transistor NM3 respectively;

[0025] The gate of the field effect transistor PM4 is connected to the gate of the field effect transistor PM2, and the drain of the field effect transistor PM4 is connected to the first end of the resistor R4 and the gate of the field effect transistor NM4 respectively;

[0026] The source electrode of the field effect transistor PM3 and the source electrode of the field effect transistor PM4 are respectively connected to the first reference terminal;

[0027] The source of the field effect transistor NM3 and the source of the field effect transistor NM4 are respectively connected to the third reference terminal;

[0028] The drain of the field effect transistor NM3 is connected to the gate of the first slave control transistor of the second conversion unit, and the drain of the field effect transistor NM4 is connected to the gate of the second slave control transistor of the second conversion unit.

[0029] In one embodiment, the pulse driving signal includes a first pulse signal and a second pulse signal, and the signal generating unit includes a first NOT gate, a second NOT gate, a buffer, a NAND gate and a NOR gate;

[0030] The input end of the first NOT gate, the first end of the NOR gate and the second end of the NAND gate are connected together to receive the input signal, and the output end of the first NOT gate is connected to the input end of the buffer;

[0031] The output end of the buffer is connected to the first end of the NAND gate and the second end of the NOR gate respectively;

[0032] The output end of the NOR gate is used to output the first pulse signal; the output end of the NAND gate is used to output the second pulse signal.

[0033] A level conversion circuit, comprising:

[0034] Negative voltage level conversion circuit;

[0035] And any of the level-assisted conversion control circuits described above.

[0036] In one embodiment, the level conversion circuit further includes:

[0037] A third NOT gate, wherein the input end of the third NOT gate is used to receive the input signal, and the output end of the third NOT gate is connected to the gate of the second main control tube of the first conversion unit.

[0038] In one embodiment, the level conversion circuit further includes:

[0039] a fourth NOT gate, wherein an input end of the fourth NOT gate is connected to the first output end of the second conversion unit;

[0040] A fifth NOT gate, wherein an input end of the fifth NOT gate is connected to the second output end of the second conversion unit.

[0041] In one embodiment, the slave control transistor of the second conversion unit, the field effect transistor NM3 and the field effect transistor NM4 are isolation field effect transistors respectively.

[0042] The above-mentioned level-assisted conversion control circuit is applied to a negative voltage level conversion circuit. The level-assisted conversion control circuit includes a signal generating unit and a control unit. When the input signal changes, the drain of the master control tube of the switch pair to be turned on in the same conversion unit is connected to the gate of its slave control tube, and is also connected to the drain of the slave control tube of another switch pair. The slave control tube is still in the on state when the input signal changes, which will affect the driving of the master control tube to the slave control tube in the switch pair to be turned on. By adopting the signal generating unit to generate a pulse driving signal when the input signal level changes, and then the control unit disconnects the slave control tube of the target conversion unit that was turned on at the previous conversion moment according to the pulse driving signal, the driving ability of the master control tube to the slave control tube in the switch pair to be turned on can be improved, the turn-on speed of the switch to be turned on can be accelerated, and finally the conversion speed of the negative voltage level conversion circuit can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a circuit structure diagram of a negative voltage level conversion circuit according to an embodiment;

[0045] Figure 2 is a structural block diagram of a level-assisted conversion control circuit according to an embodiment;

[0046] Figure 3 is a structural block diagram of a level-assisted conversion control circuit according to another embodiment;

[0047] Figure 4 is a structural block diagram of a level-assisted conversion control circuit according to another embodiment;

[0048] Figure 5 is a structural block diagram of a level-assisted conversion control circuit according to another embodiment;

[0049] Figure 6 is a structural block diagram of a level-assisted conversion control circuit according to another embodiment;

[0050] Figure 7 is a structural block diagram of a level-assisted conversion control circuit according to another embodiment;

[0051] Figure 8 FIG. 4 is a signal waveform diagram of a signal generating unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0055] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0056] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0057] Figure 1 FIG. 4 is a circuit structure diagram of a negative voltage level conversion circuit according to an embodiment of the present invention. Figure 1 As shown, the negative voltage level conversion circuit includes a first conversion unit 101 and a second conversion unit 102. The first conversion unit 101 and the second conversion unit 102 respectively include two groups of switch pairs, each of which includes a master control transistor and a slave control transistor. For example, for the first conversion unit 101, one group of switch pairs includes a master control transistor NW1 and a slave control transistor PW1, and the other group of switch pairs includes a master control transistor NW2 and a slave control transistor PW2; for the second conversion unit 102, one group of switch pairs includes a master control transistor PW3 and a slave control transistor NW3, and the other group of switch pairs includes a master control transistor PW4 and a slave control transistor NW4. Among them, the master control transistor NW1, the master control transistor NW2, the slave control transistor NW3, and the slave control transistor NW4 are N-type MOS transistors, and the slave control transistors PW1, the slave control transistor PW2, the master control transistor PW3, and the master control transistor PW4 are P-type MOS transistors. In addition, the slave transistors NW3 and NW4 of the second conversion unit 102 can be isolation field effect transistors respectively.

[0058] In the same conversion unit, the drain of the master control tube of a set of switch pairs is connected to the gate of the slave control tube, and is connected with the drain of the slave control tube of another switch pair to serve as the output terminal of the conversion unit. For example, the first conversion unit 101 includes an output terminal a1 and an output terminal a2, and the second conversion unit 102 includes an output terminal b1 and an output terminal b2. The source of the slave control tube of the first conversion unit 101 and the source of the master control tube of the second conversion unit 102 are respectively connected to the first reference terminal V1, the source of the master control tube of the first conversion unit 101 is connected to the second reference terminal V2, and the source of the slave control tube of the second conversion unit 102 is connected to the third reference terminal V3; wherein the first reference terminal is used to output a first level signal, the second reference terminal is used to output a second level signal, and the third reference terminal is used to output a third level signal; the level of the first level signal is greater than the level of the second level signal, and the level of the second level signal is greater than the level of the third level signal.

[0059] Specifically, the level of the first level signal may be greater than 0V (for example, 20V), the level of the second level signal may be equal to 0V, and the level of the third level signal may be less than 0V (i.e., negative voltage); the first conversion unit 101 is used to receive the input signal s1 and the inverted input signal s2 through two main control tubes in one-to-one correspondence, so as to turn on one of the switch pairs, and output the first level signal of the first reference end and the second level signal of the second reference end, wherein the level of the input signal may be less than the level of the first level signal, for example, 0V or 5V, so that the first conversion unit 101 can realize the conversion from positive voltage 0V-5V to 0V-20V; the second conversion unit 102 is used to receive the first level signal and the second level signal through two main control tubes in one-to-one correspondence, so as to turn on one of the switch pairs, and output the first level signal and the third level signal, so as to realize the conversion from positive voltage 0V-20V to negative voltage -20V. Wherein, the levels of the input signal and the inverted input signal are inverted, for example, they may be one of 0V and 5V respectively.

[0060] For example, assuming that the input signal s1 is at a low level, the reverse input signal is at a high level, the main control tube NW1 is disconnected, the main control tube NW2 is turned on, and the second reference terminal is connected, and then the slave control tube PW2 is also turned on, and the first reference terminal is connected, the slave control tube PW1 is disconnected, the output terminal a1 outputs the first level signal of the first reference terminal, and the output terminal a2 outputs the second level signal of the second reference terminal; the main control tube PW3 is disconnected after receiving the first level signal, and the main control tube PW4 is turned on after receiving the second level signal, thereby connecting the first reference terminal, the slave control tube NW4 is turned on, and the third reference terminal is connected, the slave control tube NW3 is disconnected, the output terminal b1 outputs the third level signal, and the output terminal b2 outputs the first level signal. When the input signal s1 changes from a low level to a high level, the master control tube NW1 is turned on and the master control tube NW2 is turned off. At this time, the output terminal a2 is in a floating state, and the slave control tube PW2 will still remain in the on state, thereby affecting the master control tube NW1 to pull down the slave control tube PW1, resulting in the slave control tube PW1 being unable to turn on quickly; similarly, for the second conversion unit 102, when the input signal s1 changes, the master control tube PW3 is turned on and the master control tube PW4 is turned off. At this time, since the slave control tube NW4 is still in the on state, it affects the master control tube PW3 to pull up the slave control tube NW3, resulting in the slave control tube NW3 being unable to turn on quickly. Similarly, when the input signal changes from a high level to a low level, for the first conversion unit 101, since the slave control PW1 remains in the on state, the slave control PW2 cannot be turned on quickly; for the second conversion unit 102, since the slave control NW3 remains in the on state, the slave control NW4 cannot be turned on quickly.

[0061] In this regard, an embodiment of the present invention provides a level-assisted conversion control circuit, the structural block diagram of which is shown in FIG. Figure 2 As shown, the level-assisted conversion control circuit includes a signal generating unit 110 and a control unit 120. The signal generating unit 110 is used to receive an input signal and generate a pulse driving signal when the input signal level changes; the control unit 120 is respectively connected to the signal generating unit 110 and the gate of the target slave control of the target conversion unit, and is used to disconnect the target slave control according to the pulse driving signal; the target conversion unit includes at least one of the first conversion unit 101 and the second conversion unit 102, and the target slave control is the slave control that is turned on by the target conversion unit at the last conversion moment.

[0062] It can be understood that the signal generating unit 110 can be connected to the gate of the master control tube NW1 to receive the input signal together, and then generate a pulse drive signal according to the level change of the input signal, wherein the pulse drive signal can be a narrow pulse signal to provide a short-time drive, so that the control unit 120 disconnects the target slave control tube at the moment when the input signal changes. The control unit 120 can disconnect the target slave control tube by providing a low level to the target slave control tube.

[0063] For example, if the target conversion unit is the first conversion unit 101, when the input signal is at a low level at the last conversion moment and jumps to a high level at the current moment, the target slave control is the slave control PW2, and the control unit 120 can be connected to the gate of the slave control PW2, so that the slave control PW2 can be temporarily disconnected according to the pulse drive signal at the input signal jump moment, so that the master control NW1 can more easily pull down the gate of the slave control PW1, thereby turning on the slave control PW1. In this way, when the input signal jumps from a low level to a high level, the conversion speed of the first conversion unit 101 is increased. After the slave control PW1 is turned on, the output terminal a1 outputs the second level signal of the second reference terminal, and the output terminal a2 outputs the first level signal of the first reference terminal, thereby driving the second conversion unit 102 to perform secondary conversion. When the input signal is at a high level at the last conversion moment and changes to a low level at the current moment, the target slave controller is the slave controller PW1, and the control unit 120 can be connected to the gate of the slave controller PW1, so that the slave controller PW1 can be temporarily disconnected according to the pulse drive signal at the input signal jump moment, so that the master controller NW2 can more easily pull down the gate of the slave controller PW2, thereby turning on the slave controller PW2. After the slave controller PW2 is turned on, the output terminal a1 outputs a first level signal of the first reference terminal, and the output terminal a2 outputs a second level signal of the second reference terminal, thereby driving the second conversion unit 102 to perform a secondary conversion, so as to improve the conversion speed of the first conversion unit 101 when the input signal changes from a high level to a low level. Therefore, the target slave controller can be at least one of the slave controllers PW1 and PW2, wherein, Figure 2 The example shows a case where the target slave controllers include the slave controller PW1 and the slave controller PW2 at the same time. In this case, the conversion speed of the first conversion unit 101 can be increased in any jump situation of the input signal.

[0064] It can be understood that since the gate of the slave control tube PW2, the drain of the master control tube NW2 and the drain of the slave control tube PW1 are connected together and serve as the output terminal a2 of the first conversion unit 101, the control unit 120 is connected to the gate of the slave control tube PW2, that is, connected to the output terminal a2; the gate of the slave control tube PW1, the drain of the master control tube NW1 and the drain of the slave control tube PW2 are connected together and serve as the output terminal a1 of the first conversion unit 101, and the control unit 120 is connected to the gate of the slave control tube PW1, that is, connected to the output terminal a1.

[0065] Similarly, if the target conversion unit is the second conversion unit 102, when the input signal is at a low level at the previous conversion moment and jumps to a high level at the current moment, the target slave controller is the slave controller NW4, and the control unit 120 can be connected to the gate of the slave controller NW4 ( Figure 2), so that the slave control NW4 can be temporarily disconnected at the moment of input signal jump according to the pulse drive signal, so that the master control PW3 can more easily pull up the gate of the slave control NW3, thereby turning on the slave control NW3. After the slave control NW3 is turned on, the output terminal b1 outputs the first level signal of the first reference terminal, and the output terminal b2 outputs the third level signal of the third reference terminal, so that when the input signal jumps from a low level to a high level, the conversion speed of the second conversion unit 102 is improved. When the input signal is at a high level at the previous conversion moment and jumps to a low level at the current moment, the target slave control is the slave control NW3, and the control unit 120 can be connected to the gate of the slave control NW3 ( Figure 2 ), so that the slave control NW3 can be temporarily disconnected at the moment of input signal jump according to the pulse drive signal, so that the master control PW4 can more easily pull up the gate of the slave control NW4, thereby turning on the slave control NW4. After the slave control NW4 is turned on, the output terminal b1 outputs the third level signal of the third reference terminal, and the output terminal b2 outputs the first level signal of the first reference terminal, so that when the input signal jumps from a high level to a low level, the conversion speed of the second conversion unit 102 is improved. Therefore, the target slave control can be at least one of the slave control NW3 and the slave control NW4, wherein, when the target slave control includes the slave control NW3 and the slave control NW4, in this case, it can be achieved that the conversion speed of the second conversion unit 102 can be improved in any jump situation of the input signal.

[0066] It can be understood that since the gate of the slave control NW4, the drain of the master control PW4 and the drain of the slave control NW3 are connected together and serve as the output terminal b2 of the second conversion unit 102, the control unit 120 is connected to the gate of the slave control NW4, that is, connected to the output terminal b2; the gate of the slave control NW3, the drain of the master control PW3 and the drain of the slave control NW4 are connected together and serve as the output terminal b1 of the second conversion unit 102, and the control unit 120 is connected to the gate of the slave control NW4, that is, connected to the output terminal b1.

[0067] The above-mentioned level auxiliary conversion control circuit is used to accelerate the level conversion time of the negative voltage level conversion circuit. Because when the input signal changes, the drain of the main control tube of the switch pair to be turned on in the same conversion unit is connected to the gate of its slave control tube, and is also connected to the drain of the slave control tube of another switch pair. The slave control tube is still in the on state when the input signal changes, which will affect the driving of the slave control tube by the main control tube in the switch to be turned on. By adopting a signal generating unit to generate a narrow pulse signal when the input signal level changes, and then the control unit accelerates the disconnection of the slave control tube of the target conversion unit that was turned on at the previous conversion moment according to the narrow pulse signal, the driving ability of the main control tube to the slave control tube in the switch to be turned on can be improved, the conduction speed of the switch to be turned on can be accelerated, and finally the conversion speed of the negative voltage level conversion circuit can be improved.

[0068] In one embodiment, the target conversion unit may include a first conversion unit 101 and a second conversion unit 102 at the same time, so that when the input signal jumps, the conversion speeds of the first conversion unit 101 and the second conversion unit 102 can be increased at the same time, thereby maximizing the overall conversion speed of the negative voltage level conversion circuit.

[0069] In one embodiment, the target conversion unit may include a first conversion unit 101, such as Figure 3 As shown, the target slave control tube may include a first target tube, the pulse driving signal includes a first pulse signal and a second pulse signal, and the control unit 120 includes a first switch unit 121, and the first switch unit 121 is respectively connected to the signal generating unit 110, the first reference terminal, the gate of the first slave control tube of the first conversion unit 101, and the gate of the second slave control tube of the first conversion unit 101. If the first slave control tube of the first conversion unit 101 is the first target tube, the first switch unit 121 enters the working state in response to the first pulse signal, and turns on the conductive path between the gate of the first slave control tube of the first conversion unit 101 and the first reference terminal to disconnect the first slave control tube of the first conversion unit 101; if the second slave control tube of the first conversion unit 101 is the first target tube, the first switch unit 121 enters the working state in response to the second pulse signal, and turns on the conductive path between the gate of the second slave control tube of the first conversion unit 101 and the first reference terminal to disconnect the second slave control tube of the first conversion unit 101.

[0070] The first pulse signal can be used to represent the input signal jumping from the first level to the second level, and the second pulse signal can be used to represent the input signal jumping from the second level to the first level, wherein the first level and the second level are one of a low level and a high level.

[0071] The first switch unit 121 is connected to the signal generating unit 110 to receive the first pulse signal and the second pulse signal, wherein two connecting branches may be provided between the first switch unit 121 and the signal generating unit 110 to transmit the first pulse signal and the second pulse signal respectively. Figure 2 shown.

[0072] The first switch unit 121 is also connected to the first reference terminal and the gates of the two slave controllers of the first conversion unit 101. The first switch unit 121 can respond to the first pulse signal or the second pulse signal to correspondingly turn on the conductive path between the first reference terminal and the gate of one of the slave controllers. Since the source of the slave controller is also connected to the first reference terminal, the voltage difference between the source and the gate of the slave controller does not reach the turn-on voltage, and the slave controller is disconnected.

[0073] Specifically, the first slave control of the first conversion unit 101 is the slave control PW1, the second slave control of the first conversion unit 101 is the slave control PW2, the first pulse signal is used to represent the input signal jumps from a high level to a low level, and the second pulse signal is used to represent the input signal jumps from a low level to a high level. If the first target tube is the slave control PW1, when the input signal jumps from a high level to a low level, the first switch unit 121 enters the working state in response to the first pulse signal, thereby turning on the conductive path between the gate of the slave control PW1 and the first reference terminal, so that the slave control PW1 is disconnected; if the first target tube is the slave control PW2, when the input signal jumps from a low level to a high level, the first switch unit 121 can enter the working state according to the second pulse signal, thereby turning on the conductive path between the gate of the slave control PW2 and the first reference terminal, so that the slave control PW2 is disconnected. In this way, the first switching unit 121 can disconnect the slave control tube of the first conversion unit 101 that was turned on at the previous conversion moment at the up-jump moment and the down-jump moment of the input signal according to the first pulse signal and the second pulse signal, thereby making it easier for the slave control tube to be turned on currently to be turned on, and ultimately improving the level conversion speed of the first conversion unit 101.

[0074] In one embodiment, the target conversion unit further includes a second conversion unit 102, the target slave control unit further includes a second target control unit, and the control unit 120 further includes a second switch unit 122. Figure 4 As shown, the second switch unit 122 is connected to the first switch unit 121 and the gate of the second target tube respectively. The first switch unit 121 is also used to drive the second switch unit 122 to disconnect the second target tube in the working state.

[0075] When the first switch unit 121 enters the working state in response to the first pulse signal or the second pulse signal, in addition to disconnecting the first target tube of the first conversion unit 101, it also drives the second switch unit 122 to disconnect the second target tube of the second conversion unit 102. In this way, the first switch unit 121 only needs to receive the pulse signal, and then use the linkage of the first switch unit 121 to the second switch unit 122. After the first switch unit 121 enters the working state, the second switch unit 122 is driven to disconnect its slave control tube that is turned on at the previous conversion moment, thereby realizing that the level conversion speed of the first conversion unit 101 is improved while the level conversion speed of the second conversion unit 102 is also improved. The control logic is simple and easy to implement.

[0076] It can be understood that the second target transistor is the slave control transistor that is turned on by the second conversion unit 102 at the last conversion moment. Figure 4The example shows that when the second target transistor includes the slave transistor NW3 and the slave transistor NW4, the second switch unit 122 is connected to the gates of the slave transistor NW3 and the slave transistor NW4 at the same time, so as to ensure that the second switch unit 122 is connected to the second target transistor in both transition states of the input signal. In one embodiment, the second target transistor may also be one of the slave transistor NW3 and the slave transistor NW4. After determining that one of the slave transistors is the second target transistor according to the transition state of the input signal, the second switch unit 122 may be connected only to the slave transistor, so as to solve the problem that the second conversion unit 102 has a slow conversion speed when the input signal is in a certain transition state.

[0077] The second switch unit 122 may disconnect the second target tube by sending a low level signal to the second target tube.

[0078] In one embodiment, the second switch unit 122 is further connected to the third reference terminal, the gate of the first slave control tube of the second conversion unit 102, and the gate of the second slave control tube of the second conversion unit 102. Figure 4 As shown, if the first slave control tube of the second conversion unit 102 is the second target tube, the second switch unit 122 is used to, under the drive of the first switch unit 121, conduct the conductive path between the gate of the first slave control tube of the second conversion unit 102 and the third reference terminal to disconnect the first slave control tube of the second conversion unit 102; if the second slave control tube of the second conversion unit 102 is the second target tube, the second switch unit 122 is used to, under the drive of the first switch unit 121, conduct the conductive path between the gate of the second slave control tube of the second conversion unit 102 and the third reference terminal to disconnect the second slave control tube of the second conversion unit 102.

[0079] Specifically, the second switch unit 122 is also connected to the third reference terminal and the gates of the two slave controllers of the second conversion unit 102. The second switch unit 122 can respond to the first level signal and the second level signal output from the output terminal a1 and the output terminal a2 of the first switch unit 121, and correspondingly turn on the conductive path between the third reference terminal and the gate of one of the slave controllers. Since the source of the slave controller is connected to the third reference terminal, the voltage difference between the source and the gate of the slave controller does not reach the turn-on voltage, and the slave controller is disconnected.

[0080] The first slave control and the second slave control may be one of the slave control NW3 and the slave control NW4. Specifically, taking the first slave control of the second conversion unit 102 as the slave control NW3 and the second slave control of the second conversion unit 102 as the slave control NW4 as an example, if the second target tube is the slave control NW3, under the drive of the first switch unit 121, the second switch unit 122 conducts the conductive path between the gate of the slave control NW3 and the third reference terminal, so that the slave control NW3 is disconnected; if the second target tube is the slave control NW4, under the drive of the first switch unit 121, the second switch unit 122 conducts the conductive path between the gate of the slave control NW4 and the third reference terminal, so that the slave control NW4 is disconnected.

[0081] It can be understood that, when the output signal jumps from a low level to a high level, the output terminal a1 of the first conversion unit 101 jumps from a first level signal to a second level signal, and the output terminal a2 jumps from a second level signal to a first level signal, the slave control tube NW4 of the second conversion unit 102 is the second target tube; when the output signal jumps from a high level to a low level, the output terminal a1 of the first conversion unit 101 jumps from a first level signal to a second level signal, and the output terminal a2 jumps from a second level signal to a first level signal, the slave control tube NW3 of the second conversion unit 102 is the second target tube. In this way, the second switch unit 122 can be driven by the first switch unit 121 to disconnect the slave control tube of the second conversion unit 102 that is turned on at the previous conversion moment at the up-jump moment and the down-jump moment of the input signal, so that the slave control tube currently to be turned on in the second conversion unit 102 is easier to turn on. Finally, through the synergistic effect of the first switch unit 121 and the second switch unit 122, it is possible to simultaneously improve the level conversion speed of the two conversion units at the moment when the input signal jumps.

[0082] In one embodiment, Figure 5 As shown, the first switch unit 121 includes a field effect transistor NM1, a field effect transistor NM2, a field effect transistor PM1, a field effect transistor PM2, a resistor R1 and a resistor R2; the gate of the field effect transistor NM1 is used to receive the first pulse signal, the source of the field effect transistor NM1 is connected to the second reference end, and the drain of the field effect transistor NM1 is respectively connected to the first end of the resistor R1 and the gate of the field effect transistor PM1; the gate of the field effect transistor NM2 is used to receive the second pulse signal, the source of the field effect transistor NM2 is connected to the second reference end, and the drain of the field effect transistor NM2 is respectively connected to the first end of the resistor R2 and the gate of the field effect transistor PM2; the second end of the resistor R1, the second end of the resistor R2, the source of the field effect transistor PM1 and the source of the field effect transistor PM2 are connected to the first reference end; the drain of the field effect transistor PM1 is connected to the gate of the first slave control tube of the first conversion unit 101; the drain of the field effect transistor NM2 is connected to the gate of the second slave control tube of the first conversion unit 101.

[0083] Specifically, taking the first slave control tube of the first conversion unit 101 as the slave control tube PW1, the second slave control tube of the first conversion unit 101 as the slave control tube PW2, the first pulse signal is used to characterize the input signal jumping from a high level to a low level, and the second pulse signal is used to characterize the input signal jumping from a low level to a high level as an example, when the input signal s1 jumps from a high level to a low level, the first target tube is the slave control tube PW1, and the field effect tube NM1 turns on the conductive path between the first reference terminal and the second reference terminal under the drive of the first pulse signal, the first end of the resistor R1 is at a low level, the field effect tube PM1 is turned on, so that the output terminal a1 is connected to the first reference terminal, and the slave control tube PW1 is disconnected. When the input signal s1 jumps from a low level to a high level, the first target tube is the slave control tube PW2, and the field effect tube NM2 turns on the conductive path between the first reference terminal and the second reference terminal under the drive of the second pulse signal. The first end of the resistor R2 is at a low level, and the field effect tube PM2 is turned on, so that the output terminal a2 is connected to the first reference terminal, and the slave control tube PW2 is disconnected.

[0084] In one embodiment, Figure 6 As shown, the second switch unit 122 includes a field effect transistor PM3, a field effect transistor PM4, a field effect transistor NM3, a field effect transistor NM4, a resistor R3 and a resistor R4; the gate of the field effect transistor PM3 is connected to the gate of the field effect transistor PM1, and the drain of the field effect transistor PM3 is respectively connected to the first end of the resistor R3 and the gate of the field effect transistor NM3; the gate of the field effect transistor PM4 is connected to the gate of the field effect transistor PM2, and the drain of the field effect transistor PM4 is respectively connected to the first end of the resistor R4 and the gate of the field effect transistor NM4; the source of the field effect transistor PM3 and the source of the field effect transistor PM4 are respectively connected to the first reference terminal; the source of the field effect transistor NM3 and the source of the field effect transistor NM4 are respectively connected to the third reference terminal; the drain of the field effect transistor NM3 is connected to the gate of the first slave control tube of the second conversion unit 102, and the drain of the field effect transistor NM4 is connected to the gate of the second slave control tube of the second conversion unit 102.

[0085] Specifically, take the first slave control tube of the second conversion unit 102 as slave control tube NW3, and the second slave control tube of the second conversion unit 102 as slave control tube NW4 as an example. When the input signal s1 jumps from a high level to a low level, the second target tube is the slave control tube NW3, and the field effect tube NM1 of the first switch unit 121 is driven by the first pulse signal to turn on the conductive path between the first reference terminal and the second reference terminal, the first end of the resistor R1 is at a low level, and the field effect tube PM3 is also turned on, thereby turning on the conductive path between the first reference terminal and the third reference terminal, the first end of the resistor R3 is at a high level, and the field effect tube NM3 is turned on, so that the output terminal b1 is connected to the third reference terminal, and the slave control tube NW3 is disconnected; When the input signal s1 changes from a low level to a high level, the second target transistor is the slave control transistor NW4, and the field effect transistor NM2 of the first switch unit 121 conducts the conductive path between the first reference terminal and the second reference terminal under the drive of the second pulse signal, the first end of the resistor R2 is at a low level, and the field effect transistor PM4 is also turned on, thereby conducting the conductive path between the first reference terminal and the third reference terminal, the first end of the resistor R4 is at a high level, and the field effect transistor NM4 is turned on, so that the output terminal b2 is connected to the third reference terminal, and the slave control transistor NW4 is disconnected. Among them, the field effect transistor NM3 and the field effect transistor NM4 can be isolation field effect transistors respectively.

[0086] In one embodiment, the pulse driving signal includes a first pulse signal and a second pulse signal. Figure 7 As shown, the signal generating unit 110 includes a first NOT gate 111, a second NOT gate 112, a buffer 113, a NAND gate 114 and a NOR gate 115. The input end of the first NOT gate 111, the first end of the NOR gate 115 and the second end of the NAND gate 114 are connected together to receive an input signal, the output end of the first NOT gate 111 is connected to the input end of the buffer 113; the output end of the buffer 113 is respectively connected to the first end of the NAND gate 114 and the second end of the NOR gate 115; the output end of the NOR gate 115 is used to output a first pulse signal; the output end of the NAND gate 114 is used to output a second pulse signal.

[0087] Combination Figure 8 As shown, the input signal s1 is a step signal, which is processed by the first NOT gate 111 to obtain the signal s1', and the signal s1' is obtained after passing through the buffer 113 to obtain the signal m. The input end of the NOR gate 115 receives the input signal s1 and the signal m respectively, and outputs the first pulse signal Y1 after processing; the input end of the NAND gate 114 receives the input signal s1 and the signal m respectively, and outputs the second pulse signal Y2 after processing.

[0088] The embodiment of the present invention also provides a level-assisted conversion control circuit, including a signal generating unit, a first switch unit, and a second switch unit. The signal generating unit includes a first NOT gate, a second NOT gate, a buffer, a NAND gate, and a NOR gate; the first switch unit includes a field effect transistor NM1, a field effect transistor NM2, a field effect transistor PM1, a field effect transistor PM2, a resistor R1, and a resistor R2; the second switch unit includes a field effect transistor PM3, a field effect transistor PM4, a field effect transistor NM3, a field effect transistor NM4, a resistor R3, and a resistor R4. The specific connection relationship and working principle of each component in the level-assisted conversion control circuit can refer to the above embodiment, and will not be repeated here.

[0089] An embodiment of the present invention further provides a level conversion circuit, including a negative voltage level conversion circuit and a level auxiliary conversion control circuit according to any one of the above embodiments.

[0090] The principle and beneficial effects of the level conversion circuit of this embodiment have been specifically described in the above embodiments and will not be repeated here.

[0091] In one embodiment, the slave control transistors NW3 and NW4 in the second conversion unit, and the field effect transistors NM3 and NM4 in the second switch unit can be isolated field effect transistors. The isolated field effect transistors are manufactured using a deep N well (DNW) process, and the DNW layer of each field effect transistor is connected to the power supply voltage VDD, so that the NBL layer and the DNW layer can play an isolation protection role, so that the substrate of each field effect transistor is isolated from the substrate of the chip, and the substrate of each field effect transistor can be connected to a negative voltage together with the source for normal use, thereby preventing the use of ordinary N-type field effect transistors because the substrate is connected to 0V ground and the source is connected to a negative voltage, thereby causing a parasitic forward-biased diode leakage between the substrate and the source.

[0092] In one embodiment, the level conversion circuit further includes a third NOT gate 201, such as Figure 7 As shown, the input end of the third NOT gate 201 is used to receive an input signal, and the output end of the third NOT gate 201 is connected to the gate of the second main control tube of the first conversion unit.

[0093] It can be understood that the input end of the third NOT gate 201 can be connected to the gate of the first main control tube of the first conversion unit to jointly receive the input signal s1, and then the third NOT gate 201 inverts the input signal s1 to obtain an inverted input signal s2, and transmits it to the gate of the second main control tube. The first main control tube can be the main control tube NW1, and the second main control tube can be the main control tube NW2.

[0094] In one embodiment, the level conversion circuit further includes a fourth NOT gate 202 and a fifth NOT gate 203 , wherein the input end of the fourth NOT gate 202 is connected to the first output end of the second conversion unit; the input end of the fifth NOT gate 203 is connected to the second output end of the second conversion unit.

[0095] refer to Figure 7 As shown, the first output end of the second conversion unit can be the output end b1, and the second output end of the second conversion unit can be the output end b2. It can be understood that the fourth NOT gate 202 and the fifth NOT gate 203 can be set according to the subsequent expected output, so that the outputs of the output end b1 and the output end b2 can be exchanged to obtain the desired target signal.

[0096] Among them, the power supply terminal of the fourth NOT gate 202 and the fifth NOT gate 203 can be connected to the first reference terminal V1, and the ground terminal of the fourth NOT gate 202 and the fifth NOT gate 203 can be connected to the third reference terminal V3, so as to output the first level signal of the first reference terminal and the third level signal of the third reference terminal according to the signals output by the output terminal b1 and the output terminal b2 respectively.

[0097] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0098] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A level-assisted conversion control circuit, characterized in that: Applied to a negative voltage level conversion circuit, the first conversion unit and the second conversion unit of the negative voltage level conversion circuit respectively include two groups of switch pairs; in the same conversion unit, the drain of the master control tube of one switch pair is connected to the gate of the slave control tube, and is commonly connected with the drain of the slave control tube of the other switch pair to serve as the output end of the conversion unit; the source of the slave control tube of the first conversion unit and the source of the master control tube of the second conversion unit are respectively connected to the first reference end, the source of the master control tube of the first conversion unit is connected to the second reference end, and the source of the slave control tube of the second conversion unit is connected to the third reference end; The level-assisted conversion control circuit comprises: A signal generating unit, configured to receive an input signal and generate a pulse driving signal when a level of the input signal changes; A control unit, connected to the gates of the target slave control tube of the signal generating unit and the target conversion unit, respectively, and used to disconnect the target slave control tube according to the pulse driving signal; The target conversion unit includes at least one of the first conversion unit and the second conversion unit, and the target slave controller is a slave controller of the target conversion unit that is turned on at a previous conversion moment.

2. The level-assisted conversion control circuit according to claim 1, characterized in that: The target conversion unit includes the first conversion unit, the target slave control includes a first target control, the pulse drive signal includes a first pulse signal and a second pulse signal, and the control unit includes: A first switch unit is respectively connected to the signal generating unit, the first reference terminal, a gate of a first slave control tube of the first conversion unit, and a gate of a second slave control tube of the first conversion unit; If the first slave control tube of the first conversion unit is the first target tube, the first switch unit enters a working state in response to the first pulse signal, and turns on a conductive path between the gate of the first slave control tube of the first conversion unit and the first reference terminal to disconnect the first slave control tube of the first conversion unit; If the second slave control tube of the first conversion unit is the first target tube, the first switch unit enters the working state in response to the second pulse signal, and turns on the conductive path between the gate of the second slave control tube of the first conversion unit and the first reference end to disconnect the second slave control tube of the first conversion unit.

3. The level-assisted conversion control circuit according to claim 2, characterized in that: The target conversion unit further includes the second conversion unit, the target slave control unit further includes a second target control unit, and the control unit further includes: The second switch unit is connected to the gates of the first switch unit and the second target tube respectively. The first switch unit is also used to drive the second switch unit to disconnect the second target tube in the working state.

4. The level-assisted conversion control circuit according to claim 3, characterized in that: The second switch unit is also connected to the third reference terminal, the gate of the first slave control tube of the second conversion unit, and the gate of the second slave control tube of the second conversion unit; If the first slave control tube of the second conversion unit is the second target tube, the second switch unit is used to, under the drive of the first switch unit, conduct the conductive path between the gate of the first slave control tube of the second conversion unit and the third reference terminal to disconnect the first slave control tube of the second conversion unit; If the second slave control tube of the second conversion unit is the second target tube, the second switch unit, under the drive of the first switch unit, turns on the conductive path between the gate of the second slave control tube of the second conversion unit and the third reference terminal to disconnect the second slave control tube of the second conversion unit.

5. The level-assisted conversion control circuit according to claim 4, characterized in that: The first switch unit includes a field effect transistor NM1, a field effect transistor NM2, a field effect transistor PM1, a field effect transistor PM2, a resistor R1 and a resistor R2; The gate of the field effect transistor NM1 is used to receive the first pulse signal, the source of the field effect transistor NM1 is connected to the second reference end, and the drain of the field effect transistor NM1 is respectively connected to the first end of the resistor R1 and the gate of the field effect transistor PM1; The gate of the field effect transistor NM2 is used to receive the second pulse signal, the source of the field effect transistor NM2 is connected to the second reference end, and the drain of the field effect transistor NM2 is respectively connected to the first end of the resistor R2 and the gate of the field effect transistor PM2; The second end of the resistor R1, the second end of the resistor R2, the source of the field effect transistor PM1 and the source of the field effect transistor PM2 are connected to the first reference end; The drain of the field effect transistor PM1 is connected to the gate of the first slave control transistor of the first conversion unit; the drain of the field effect transistor NM2 is connected to the gate of the second slave control transistor of the first conversion unit.

6. The level-assisted conversion control circuit according to claim 5, characterized in that: The second switch unit includes a field effect transistor PM3, a field effect transistor PM4, a field effect transistor NM3, a field effect transistor NM4, a resistor R3 and a resistor R4; The gate of the field effect transistor PM3 is connected to the gate of the field effect transistor PM1, and the drain of the field effect transistor PM3 is connected to the first end of the resistor R3 and the gate of the field effect transistor NM3 respectively; The gate of the field effect transistor PM4 is connected to the gate of the field effect transistor PM2, and the drain of the field effect transistor PM4 is connected to the first end of the resistor R4 and the gate of the field effect transistor NM4 respectively; The source electrode of the field effect transistor PM3 and the source electrode of the field effect transistor PM4 are respectively connected to the first reference terminal; The source of the field effect transistor NM3 and the source of the field effect transistor NM4 are respectively connected to the third reference terminal; The drain of the field effect transistor NM3 is connected to the gate of the first slave control transistor of the second conversion unit, and the drain of the field effect transistor NM4 is connected to the gate of the second slave control transistor of the second conversion unit.

7. The level-assisted conversion control circuit according to claim 6, characterized in that: The slave control transistor of the second conversion unit, the field effect transistor NM3 and the field effect transistor NM4 are isolation field effect transistors respectively.

8. The level-assisted conversion control circuit according to claim 1, characterized in that: The pulse driving signal includes a first pulse signal and a second pulse signal, and the signal generating unit includes a first NOT gate, a second NOT gate, a buffer, a NAND gate and a NOR gate; The input end of the first NOT gate, the first end of the NOR gate and the second end of the NAND gate are connected together to receive the input signal, and the output end of the first NOT gate is connected to the input end of the buffer; The output end of the buffer is connected to the first end of the NAND gate and the second end of the NOR gate respectively; The output end of the NOR gate is used to output the first pulse signal; The output end of the NAND gate is used to output the second pulse signal.

9. A level conversion circuit, characterized in that: include: Negative voltage level conversion circuit; And the level-assisted conversion control circuit according to any one of claims 1 to 8.

10. The level conversion circuit according to claim 9, characterized in that: The level conversion circuit further includes: A third NOT gate, wherein the input end of the third NOT gate is used to receive the input signal, and the output end of the third NOT gate is connected to the gate of the second main control tube of the first conversion unit.

11. The level conversion circuit according to claim 9, characterized in that: The level conversion circuit further includes: a fourth NOT gate, wherein an input end of the fourth NOT gate is connected to the first output end of the second conversion unit; A fifth NOT gate, wherein an input end of the fifth NOT gate is connected to the second output end of the second conversion unit.

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