A multi-reference voltage generation circuit and method based on resistor array module

Abstract

The embodiment of the present invention discloses a multi-reference voltage generation circuit and method based on a resistor array module. In a specific implementation, the module includes a decoder, N resistors connected in series, and a switch connected between each resistor and the decoder; wherein the decoder receives a selection signal and a gate voltage control signal, and outputs a switch control signal to the switch; the switch selects the corresponding resistor to connect to the module in response to the switch control signal. This implementation can provide different reference voltage values ​​for the chip as needed, has better compatibility and accuracy in the same chip, greatly improves integration, and reduces repeated circuits.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuits, and more specifically, to a multi-reference voltage generating circuit and method based on a resistor array module. Background Art

[0002] Among various analog circuits, voltage reference and current reference are widely included. The reference is a DC quantity, which has little relationship with power supply and process parameters, but is determined by temperature. The reference voltage is usually generated and output by a reference voltage generating circuit. According to the number of reference voltages that the reference voltage generating circuit can output, the reference voltage generating circuit is usually divided into a single reference voltage generating circuit and a multi-reference voltage generating circuit.

[0003] The conventional multi-reference voltage generating circuit is only applicable to the environment with low requirements on the stability of the reference voltage, but is far from meeting the requirements in the environment with high requirements on the stability of the reference voltage.

[0004] Therefore, there is an urgent need to propose a multi-reference voltage circuit that is more compatible and accurate, greatly improves integration and reduces duplicate circuits. Summary of the invention

[0005] The object of the present invention is to provide a multi-reference voltage generating circuit and method based on a resistor array module to solve at least one of the problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a resistor array module, the module comprising a decoder, N resistors connected in series, and a switch connected between each resistor and the decoder; wherein

[0008] The decoder receives a selection signal and a gate voltage control signal, and outputs a switch control signal to the switch;

[0009] The switch selects a corresponding resistor to connect to the module in response to the switch control signal.

[0010] Optionally, the selection signal is a one-bit digital signal; and the gate voltage control signal is a four-bit digital signal.

[0011] Optionally, when the selection signal is 1 and the gate voltage control signal is 0000 to 1010, the resistor array module outputs a first uniform voltage signal between -1.6V and -2.6V based on the input voltage.

[0012] Optionally, when the selection signal is 0 and the gate voltage control signal is 0000 to 0101, the resistor array module outputs a second uniform voltage signal of -0.5V to -1V based on the input voltage.

[0013] Optionally, the resistor is a precision resistor.

[0014] Optionally, the first to fifth input terminals of the decoder receive the selection signal and the gate voltage control signal, and the output terminal is connected to the first input terminal of the switch;

[0015] The input end of the resistor array module is the first end of the first resistor among the N series resistors, and the second end of the Nth resistor among the N series resistors is connected to the output end of the resistor array module;

[0016] The second ends of the N-1 resistors are connected to the second input end of the switch according to the switch control signal;

[0017] The output end of the resistor array module is the output end of the switch.

[0018] A second aspect of the present invention provides a circuit for generating multiple reference voltages, the circuit comprising:

[0019] A voltage reference generation module, used for generating a negative reference voltage;

[0020] A voltage conversion module, used to implement a feedback network and provide a driving current;

[0021] a current amplification module, used to amplify the driving current and output the amplified current; and the resistor array module; wherein

[0022] The voltage conversion circuit forms a feedback loop with the resistor array module, and outputs different driving currents based on the reference voltage and the control signal.

[0023] Optionally, the voltage reference generation module includes using a symmetrical operational amplifier reference to generate a reference voltage of -1.2V.

[0024] Optionally, the output end of the voltage reference generation module is connected to the first input end of the voltage conversion module; the output end of the resistor array module is connected to the second input end of the voltage conversion module;

[0025] The first output end of the voltage conversion module is connected to the input end of the resistor array module; the second output end of the voltage conversion module is connected to the first input end of the current amplification module;

[0026] The first output end of the current amplifying module is connected to the second input end of the current amplifying module;

[0027] The third output terminal of the voltage conversion module is connected to the third input terminal of the current amplification module.

[0028] A third aspect of the present invention provides a method for generating multiple reference voltages, the method comprising:

[0029] Using a voltage reference generation module to generate a negative reference voltage;

[0030] Using the voltage conversion module, the feedback network is realized and the driving current is provided;

[0031] Use the current amplifier module to amplify the current capacity of the output signal;

[0032] The resistor array module is used to change the voltage.

[0033] The beneficial effects of the present invention are as follows:

[0034] A resistor array module disclosed in the present invention realizes voltage conversion and provides multiple reference voltages, which can provide different reference voltage values ​​for chips as needed, has better compatibility and accuracy in the same chip, greatly improves integration, and reduces repeated circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0036] Figure 1 A schematic structural diagram of a resistor array module provided in an embodiment of the present invention is shown.

[0037] Figure 2 A schematic diagram of the structure of a circuit for generating multiple reference voltages provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0038] In order to explain the present invention more clearly, the present invention is further described below in conjunction with embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and the protection scope of the present invention should not be limited thereto.

[0039] The conventional multi-reference voltage generating circuit is only applicable to the environment with low requirements on the stability of the reference voltage, but is far from meeting the requirements in the environment with high requirements on the stability of the reference voltage.

[0040] Therefore, there is an urgent need to propose a multi-reference voltage circuit that is more compatible and accurate, greatly improves integration and reduces duplicate circuits.

[0041] In view of this, an embodiment of the present invention provides a resistor array module, which includes a decoder, N resistors connected in series, and a switch connected between each resistor and the decoder; wherein the decoder receives a selection signal and a gate voltage control signal, and outputs a switch control signal to the switch; and the switch selects a corresponding resistor to connect to the module in response to the switch control signal.

[0042] In a possible implementation, the selection signal is a one-bit digital signal; and the gate voltage control signal is a four-bit digital signal.

[0043] In a possible implementation, when the selection signal is 1 and the gate voltage control signal is 0000 to 1010, the resistor array module outputs a first uniform voltage signal between -1.6V and -2.6V based on the input voltage.

[0044] In a possible implementation, when the selection signal is 0 and the gate voltage control signal is 0000 to 0101, the resistor array module outputs a second uniform voltage signal of -0.5V to -1V based on the input voltage.

[0045] In a possible implementation manner, the resistor is a precision resistor.

[0046] In a possible implementation, the first to fifth input terminals of the decoder receive the selection signal and the gate voltage control signal, and the output terminal is connected to the first input terminal of the switch; the input terminal of the resistor array module is the first terminal of the first resistor among the N series resistors, and the second terminal of the Nth resistor among the N series resistors is connected to the output terminal of the resistor array module; the second terminals of the N-1 resistors are connected to the second input terminal of the switch according to the switch control signal; and the output terminal of the resistor array module is the output terminal of the switch.

[0047] Specifically, Figure 1 The structural schematic diagram of the resistor array module provided by an embodiment of the present invention is shown. The resistor array module is controlled by a 1-bit NSEL selection signal and a 4-bit B (0:3) gate voltage control signal, where 1 is connected to 0V and 0 is connected to -5V. When NSEL is 1, VB outputs a uniform voltage signal between -1.6V and -2.6V. When NSEL is 0, VB outputs a uniform voltage signal between -0.5V and -1V. When all inputs are floating or the input settings are invalid, the voltage output is -5V. Table 1 shows the corresponding relationship between NSEL and B (0:3) and the gate voltage output of the VB terminal.

[0048] Table 1 Control signal truth table

[0049]

[0050]

[0051] This circuit can provide multiple reference voltages for the subsequent circuits. In some power modulation chips, if multiple different voltage drivers are required for specific purposes, this circuit can be integrated. This circuit uses very few MOS tubes in the voltage conversion module to realize the feedback loop to provide voltage selection and output the current to drive the next stage op amp. The integrated chip can be selected outside the chip through numerical control, DIP switch, bonding to the ground, etc. as needed. The use of this circuit can greatly improve the integration level, and different voltages can be output using an adjustable reference.

[0052] A second embodiment of the present invention provides a multi-reference voltage generating circuit, which includes a voltage reference generating module for generating a negative reference voltage; a voltage conversion module for realizing a feedback network and providing a driving current; a current amplifying module for amplifying the driving current and outputting the amplified current; and the resistor array module; wherein the voltage conversion circuit forms a feedback loop with the resistor array module to output different driving currents based on the reference voltage and the control signal.

[0053] Specifically, the purpose of this embodiment is to control the voltage provided by the resistor array module and the reference circuit through digital control or a dial switch to achieve voltage conversion and provide multiple reference voltages. This embodiment can provide different reference voltage values ​​for the chip, and has better compatibility and accuracy in the same chip, and greatly improves the integration and reduces repeated circuits. This embodiment is usually used in power modulation chips that provide multi-channel drives, such as T / R component power modulation chips. When the chip needs to provide drain control signals or gate bias signals to power amplifiers, driver amplifiers, and low-noise amplifiers, different voltage sizes are required. This method can provide reference voltages through digital control.

[0054] In a possible implementation, the voltage reference generation module includes using a symmetrical operational amplifier reference to generate a reference voltage of -1.2V.

[0055] In a possible implementation, the output end of the voltage reference generation module is connected to the first input end of the voltage conversion module; the output end of the resistor array module is connected to the second input end of the voltage conversion module; the first output end of the voltage conversion module is connected to the input end of the resistor array module; the second output end of the voltage conversion module is connected to the first input end of the current amplification module; the first output end of the current amplification module is connected to the second input end of the current amplification module; and the third output end of the voltage conversion module is connected to the third input end of the current amplification module.

[0056] Specifically, Figure 2The schematic diagram of the circuit structure for generating multiple reference voltages provided by an embodiment of the present invention is shown. A multi-voltage reference generating circuit includes a voltage reference generating module, a resistor array module, a voltage conversion module, and a current amplification module. The voltage reference module includes a negative voltage reference generating circuit, which uses a symmetrical operational amplifier reference, and its function is to generate a -1.2V reference voltage for comparison and amplification by the subsequent stage. The resistor array module uses multiple precision resistors in series, and an external digital signal is connected to the resistor through switch control selection, thereby realizing a change in voltage. The resistor array module and the voltage conversion circuit jointly realize voltage output, and a feedback loop is formed between the voltage conversion circuit and the resistor, which can not only offset the temperature coefficient of the reference to form a stable output, but also the voltage conversion circuit draws out current to drive the next stage operational amplifier. Finally, the current capacity of the output signal is amplified by the operational amplifier. The characteristic point of the voltage conversion circuit is that a very simple circuit is used to synchronously realize the feedback network and provide a driving current to drive the next stage operational amplifier.

[0057] The third embodiment of the present invention provides a method for generating multiple reference voltages, which includes using a voltage reference generation module to generate a negative reference voltage; using a voltage conversion module to implement a feedback network and provide a driving current; using a current amplification module to amplify the current capacity of the output signal; and using the resistor array module to change the voltage size.

[0058] Specifically, the voltage reference module generates a -1.2V reference voltage through a negative voltage reference circuit, and then obtains the required voltage through the resistor array module and the voltage conversion circuit. The voltage conversion circuit also provides current to the next-stage op amp, and finally the next-stage op amp amplifies the current capacity. The external digital signal of the resistor array module passes through the switch in the resistor array to select the number of resistors connected, and the voltage is distributed according to the resistor voltage division principle, so that different digital signals can be connected to different resistors and output different voltages.

[0059] This method can provide multiple reference voltages for the subsequent circuits and is suitable for power chips. It can provide different voltages and references with certain driving capabilities for the same power chip as required, and can be numerically changed or adjusted off-chip as needed. The voltage is changed by controlling the resistor value connected through the resistor array module, and finally output through the op amp. This method can not only obtain a wide range of reference voltage output, but also has the characteristic point of using a very simple circuit feedback network to make the output have good temperature characteristics, and provide a driving current to drive the next stage op amp, and finally output a signal with high driving capability.

[0060] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0061] It should also be noted that, in the description of the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A resistor array module, characterized in that: The module includes a decoder, N resistors connected in series, and switches connected between each resistor and the decoder; The decoder receives a selection signal and a gate voltage control signal, and outputs a switch control signal to the switch; The switch selects a corresponding resistor to connect to the module in response to the switch control signal; When the selection signal is 1 and the gate voltage control signal is 0000 to 1010, the resistor array module outputs a first uniform voltage signal between -1.6V and -2.6V based on the input voltage; When the selection signal is 0 and the gate voltage control signal is 0000 to 0101, the resistor array module outputs a second uniform voltage signal between -0.5V and -1V based on the input voltage; When all the gate voltage control signals are floating or the input settings are invalid, the resistor array module outputs a voltage of -5V based on the input voltage; The first to fifth input terminals of the decoder receive the selection signal and the gate voltage control signal, and the output terminal is connected to the first input terminal of the switch; The input end of the resistor array module is the first end of the first resistor among the N series resistors, and the second end of the Nth resistor among the N series resistors is connected to the output end of the resistor array module; The second ends of the N-1 resistors are connected to the second input end of the switch according to the switch control signal; The output end of the resistor array module is the output end of the switch; The selection signal is a one-bit digital signal; the gate voltage control signal is a four-bit digital signal.

2. The resistor array module according to claim 1, characterized in that: The resistor is a precision resistor.

3. A circuit for generating multiple reference voltages, characterized in that: The circuit includes A voltage reference generation module, used for generating a negative reference voltage; A voltage conversion module, used to implement a feedback network and provide a driving current; A current amplifying module, used for amplifying the driving current and outputting the amplified current; as well as The resistor array module according to claim 1; in The voltage conversion module forms a feedback loop with the resistor array module, and outputs different driving currents based on the reference voltage and the control signal.

4. The multi-reference voltage generating circuit according to claim 3, characterized in that: The voltage reference generation module includes a symmetrical operational amplifier reference to generate a -1.2V reference voltage.

5. The multi-reference voltage generating circuit according to claim 3, characterized in that: The output end of the voltage reference generation module is connected to the first input end of the voltage conversion module; the output end of the resistor array module is connected to the second input end of the voltage conversion module; The first output end of the voltage conversion module is connected to the input end of the resistor array module; the second output end of the voltage conversion module is connected to the first input end of the current amplification module; The first output end of the current amplifying module is connected to the second input end of the current amplifying module; The third output terminal of the voltage conversion module is connected to the third input terminal of the current amplification module.

6. A method for generating multiple reference voltages, characterized in that: The method includes Using a voltage reference generation module to generate a negative reference voltage; Using the voltage conversion module, the feedback network is realized and the driving current is provided; Use the current amplifier module to amplify the current capacity of the output signal; The resistor array module described in claim 1 is used to change the voltage.

Images