Passive gain adjustment circuit, method, device and storage medium

Abstract

The present invention provides a passive gain adjustment circuit, method, device, and storage medium, comprising: an input terminal, an output terminal, and an adjustment unit; the adjustment unit comprises m dual-switch capacitor subunits, where m is a positive integer; each dual-switch capacitor subunit comprises a first switch, a second switch, and a capacitor, wherein one end of the first switch is commonly connected to one end of the second switch and one end of the capacitor, the other end of the first switch is connected to the input terminal, the other end of the second switch is grounded, and the other end of the capacitor is connected to the output terminal; wherein the adjustment unit is configured to passively adjust the gain of a first radio frequency signal input from the input terminal to obtain a first modulated signal. The circuit of the present invention can greatly increase the gain adjustment dynamic range of the adjustment unit, thereby increasing the number of gain levels of the circuit. Under a certain gain adjustment dynamic range, the number of switch capacitor arrays can be greatly reduced, thereby improving the integration of the integrated circuit layout.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a passive gain adjustment circuit, method, device and storage medium. Background Art

[0002] In RF communication integrated circuit systems, variations in transmit power and channel length can cause differences in receiver input signal power, necessitating a wide receiver gain adjustment range. In particular, large gain reduction is required to maintain receiver linearity when operating with large input signals. Consequently, passive gain technology, with its advantages of high linearity and simple structure, is widely used in gain adjustment circuits for large signals.

[0003] To improve the dynamic range of a receiver, gain adjustment of the received signal is necessary. Currently, existing passive gain technologies require a large number of gain levels to achieve a small gain step size and a wide gain adjustment range. This increases the number of capacitor arrays and occupies a large amount of integrated circuit layout area.

[0004] Therefore, how to better implement gain adjustment in radio frequency communication integrated circuit systems has become an urgent problem to be solved in the industry. Summary of the Invention

[0005] The present invention provides a passive gain adjustment circuit, method, device and storage medium for better implementing gain adjustment in a radio frequency communication integrated circuit system.

[0006] The present invention provides a passive gain adjustment circuit, comprising:

[0007] Input terminal, output terminal and adjustment unit;

[0008] Wherein, the adjustment unit includes m dual-switch capacitor sub-units, where m is a positive integer;

[0009] Each of the dual-switch capacitor subunits includes a first switch, a second switch, and a capacitor, one end of the first switch is commonly connected to one end of the second switch and one end of the capacitor, the other end of the first switch is connected to the input end, the other end of the second switch is grounded, and the other end of the capacitor is connected to the output end;

[0010] The adjustment unit is configured to perform passive gain adjustment on the first radio frequency signal inputted from the input end to obtain a first modulated signal.

[0011] According to a passive gain adjustment circuit provided by the present invention, the circuit further includes: a feedback controller;

[0012] The adjustment unit performs passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and sends the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal;

[0013] The feedback controller generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit;

[0014] The adjustment unit performs gain adjustment based on the gain adjustment signal, and performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal.

[0015] According to a passive gain adjustment circuit provided by the present invention, the adjustment unit is specifically used for:

[0016] Adjusting the switch states of the first switch and the second switch according to the gain adjustment signal to determine a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal;

[0017] According to the first capacitor and the second capacitor, passive gain adjustment is performed on the first radio frequency signal inputted from the input end to obtain the first modulated signal.

[0018] According to a passive gain adjustment circuit provided by the present invention, in each of the dual-switch capacitor subunits, the capacitor is a metal-insulator-metal capacitor or a metal-oxide-metal capacitor.

[0019] According to a passive gain adjustment circuit provided by the present invention, in each of the dual-switch capacitor subunits, the model of the first switch is a complementary metal oxide semiconductor switch or a metal oxide semiconductor switch, and the model of the second switch is a metal oxide semiconductor switch.

[0020] The present invention further provides a passive gain adjustment method applied to the above passive gain adjustment circuit, comprising:

[0021] The input end receives a first radio frequency signal and sends the first radio frequency signal to the adjustment unit;

[0022] The adjustment unit performs passive gain adjustment on the first radio frequency signal to obtain a first modulated signal, and sends the first modulated signal to the output end;

[0023] The output end outputs the first modulated signal.

[0024] According to a passive gain adjustment method provided by the present invention, before sending the first modulated signal to the output end, the method further includes:

[0025] The adjustment unit performs passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and sends the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal;

[0026] The feedback controller generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit;

[0027] The adjustment unit performs gain adjustment based on the gain adjustment signal, and performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal.

[0028] According to a passive gain adjustment method provided by the present invention, the adjustment unit performs gain adjustment based on the gain adjustment signal, and the adjustment unit performs passive gain adjustment on the first RF signal based on the gain adjustment signal to obtain the first modulated signal, including:

[0029] The adjustment unit adjusts the switch states of the first switch and the second switch according to the gain adjustment signal, and determines a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal;

[0030] The gain-level-adjusted adjustment unit performs passive gain adjustment on the first radio frequency signal input from the input end according to the first capacitor and the second capacitor to obtain the first modulated signal.

[0031] The present invention also provides a passive gain adjustment device, comprising:

[0032] An input module, configured to receive a first radio frequency signal at an input end and send the first radio frequency signal to an adjustment unit;

[0033] a first adjustment module, configured for the adjustment unit to perform passive gain adjustment on the first RF signal to obtain a first modulated signal, and to send the first modulated signal to an output end;

[0034] An output module is configured to output the first modulated signal at the output end.

[0035] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any of the above-mentioned passive gain adjustment methods are implemented.

[0036] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of any one of the above-mentioned passive gain adjustment methods are implemented.

[0037] The passive gain adjustment circuit, method, device, and storage medium provided by the present invention utilize the termination switching of the dual-switch capacitor plates of the adjustment unit to switch the switch states of the first switch and the second switch, thereby increasing the number of capacitors connected to the ground terminal, thereby greatly increasing the gain adjustment dynamic range of the adjustment unit. This can increase the number of gain levels of the circuit, enhance signal attenuation, and improve the amplitude of large signal input. Furthermore, under the condition of a certain gain adjustment dynamic range, the number of switch capacitor arrays can be greatly reduced, thereby improving the integration of the integrated circuit layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a circuit diagram of a passive gain adjustment circuit in the prior art;

[0040] Figure 2 This is one of the circuit diagrams of the passive gain adjustment circuit provided by an embodiment of the present invention;

[0041] Figure 3 This is the second circuit diagram of the passive gain adjustment circuit provided by an embodiment of the present invention;

[0042] Figure 4 1 is a flow chart of a passive gain adjustment method provided by an embodiment of the present invention;

[0043] Figure 5 It is a structural diagram of a passive gain adjustment device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] The following combination Figure 1-Figure 5 The present invention describes a passive gain adjustment circuit, method, device and storage medium.

[0046] Figure 1 is a circuit diagram of a passive gain adjustment circuit in the prior art, such as Figure 1 As shown in the prior art, the adjustment unit 1 of the circuit adopts a switch capacitor array, including multiple switches 11, multiple capacitors 12, a grounding capacitor 13, an input terminal 14, an output terminal 15 and a ground terminal 16. The switch 11 is used to select whether the capacitor 12 is connected to the input terminal 14. Assume that the number of capacitors 12 in the adjustment unit 1 is m-1, and the capacitance values are C1, C2, ..., C m-1 The capacitance value of capacitor 13 connected to ground terminal 16 is C m , where m>2, m is a positive integer, C1, C2, ..., C m-1 、C m The capacitance values used are not necessarily the same. The circuit gain Ga1 is calculated as:

[0047] Ga1=Ci n / (C m +Ci n ); (1)

[0048] Among them, C in Represents the sum of the capacitance values connected to the input terminals, C m Indicates the capacitance value of the capacitor connected to the ground.

[0049] like Figure 1 As shown, due to C1 to C m-1 The control method is the same, without loss of generality, here we let C1>C2>…>C m-1 The maximum gain Ga_max and minimum gain Ga_min that can be obtained by the prior art passive gain adjustment circuit are:

[0050] Ga_max1=(C1+…+C m-1 ) / (C1+…+C m ); (2)

[0051] Ga_min1=C m-1 / (C m-1 +Cm ); (3)

[0052] From formula (3), we can see that in order to maximize attenuation, the capacitance value of Cm can only be selected as large as possible. In order to increase the maximum gain Ga_max1, C1+…+C m The total capacitance value of C-1 should be as large as possible, even much larger than C m Therefore, the traditional capacitor area is large (because C m large enough).

[0053] At the same time, in order to achieve a small gain step and a large gain adjustment range, the conventional circuit without gain adjustment needs to add a large number of gain gears and increase the number of capacitor arrays, resulting in a large amount of integrated circuit layout area being occupied.

[0054] To address the above-mentioned defects in the prior art, the present invention provides a passive gain adjustment circuit, method, device and storage medium.

[0055] Figure 2 is one of the circuit diagrams of the passive gain adjustment circuit provided by an embodiment of the present invention, such as Figure 2 Shown, including:

[0056] Input terminal 3, output terminal 4 and adjustment unit 2;

[0057] Wherein, the adjustment unit includes m dual-switch capacitor subunits 21, where m is a positive integer;

[0058] Each of the dual-switch capacitor subunits 21 includes a first switch 211, a second switch 213, and a capacitor 212. One end of the first switch 211 is commonly connected to one end of the second switch 213 and one end of the capacitor 212. The other end of the first switch 211 is connected to the input terminal 3. The other end of the second switch 213 is grounded 214. The other end of the capacitor 212 is connected to the output terminal 4.

[0059] The adjustment unit 2 is configured to perform passive gain adjustment on the first radio frequency signal inputted from the input terminal 3 to obtain a first modulated signal.

[0060] Specifically, in order to compare with the prior art, in the embodiment of the present invention, the number of capacitors 212 in the adjustment unit 2 is the same as that of the prior art, which is m, namely C1, C2, ..., C m , where m>2, m is a positive integer, C1, C2, ..., C m-1 、C m The capacitance values used are not necessarily the same. Similarly, since C1 to C m-1 The control method is the same, without loss of generality, here we let C1>C2>…>C m-1 , and Cm Set according to the gain range requirements, and continue to refer to Figure 1 and Figure 2 Compared to the passive gain adjustment technology in the prior art, the circuit of the embodiment of the present invention uses two switches 211 and 213. The left plate of capacitor 212 can have three connection states by connecting to the first switch 211 and the second switch 213: the first switch 211 is closed, the second switch 213 is open, and the left plate of capacitor 212 is connected to the input terminal 3; or the first switch 211 is open, the second switch 213 is closed, and the left plate of capacitor 212 is connected to the ground terminal 214; or the first switch 211 and the second switch 213 are both open, and the left plate of capacitor 212 is left floating. In contrast, the prior art only has one switch, and the left plate of the capacitor in its circuit has only two connection states: connected to the input terminal or floating, and only one left plate of the capacitor is switched to ground by the switch.

[0061] In an embodiment of the present invention, the gain dynamic range of the adjustment unit 2 is determined based on the capacitance of the capacitor 212 conductively connected to the input terminal 3 in the dual-switch capacitor subunit 21 and the capacitance of the capacitor 212 conductively connected to the ground terminal 214 in the dual-switch capacitor subunit 21.

[0062] Therefore, in the embodiment of the present invention, the left plate of the capacitor 212 in the adjustment unit 2 is connected to the input terminal 3, to the ground terminal 214, or to be left floating by introducing two switches, namely, the first switch 211 and the second switch 213. By switching the switch states of the two switches, the left plate of the capacitor 212 in each dual-switch capacitor sub-unit 21 can have three connection states, namely, connected to the input terminal 3, connected to the ground terminal 214, or left floating. Depending on the connection state of the capacitor 212 in each dual-switch capacitor sub-unit 21, the gain of the passive gain adjustment circuit in the embodiment of the present invention is:

[0063] Ga2=C V / (C V +C G ); (4)

[0064] Among them, C V The sum of the capacitances of the capacitors 212 connected to the input terminal 3 is represented by the left plate of the capacitor, C G Represents the sum of the capacitances of the capacitors 212 connected to the left plate of the capacitor and the ground terminal 214.

[0065] In the embodiment of the present invention, the gain dynamic range of the passive gain adjustment circuit is Ga_min2 to Ga_max2, wherein the minimum gain Ga_min2 is determined when the adjustment unit 2 is in the minimum gain connection mode. In the minimum gain connection mode, the capacitor 212 with the smallest capacitance C in the adjustment unit is mThe first switch 211 of the dual-switch capacitor subunit 21 is in the closed state, and the second switch 213 is in the open state. The first switches 211 of all other dual-switch capacitor units 21 except the dual-switch capacitor unit 21 are in the open state, and the second switches 213 are in the closed state. At this time, the minimum gain Ga_min2 is:

[0066] Ga_min2={C m-1 , C m}min / (C1+…+C m ); (5)

[0067] The maximum gain Ga_max2 is determined when the adjustment unit 2 is in the maximum gain connection mode. In the maximum gain connection mode, the capacitor 212 with the smallest capacitance C in the adjustment unit 2 is m The first switch 211 of the dual-switch capacitor subunit 21 is in the open state, the second switch 213 is in the closed state, and the first switches 211 of all other dual-switch capacitor units 21 except the dual-switch capacitor unit 21 are in the closed state, and the second switches 213 are in the open state. At this time, the maximum gain Ga_max2 is:

[0068] Ga_max2=(C1+…+C m-2 +{C m-1 , C m}max) / (C1+…+C m ); (6)

[0069] From formula (5) and formula (6), we know that Ga_max2+Ga_min2=1, so as long as the minimum capacitance is small (i.e., C m is small enough), Ga_min is small enough, and at this time Ga_max=1-Ga_min is naturally large enough, so the capacitor area of the present invention is small (because Cm can be small enough).

[0070] Through comparative analysis, it can be found that the minimum gain represented by formula (5) is much smaller than that of formula (3), and the maximum gain represented by formula (6) is not less than that of formula (2).

[0071] It can be seen from this that compared with the gain dynamic range obtained by the passive gain adjustment technology in the prior art, the minimum gain of the passive gain adjustment circuit in the embodiment of the present invention is much smaller than the minimum gain of the passive gain adjustment circuit in the prior art, and the maximum gain of the passive gain adjustment circuit in the embodiment of the present invention is not less than the maximum gain of the passive gain adjustment circuit in the prior art, that is, the gain dynamic range of the passive gain adjustment circuit in the embodiment of the present invention is much larger than that of the passive gain adjustment circuit in the prior art; that is, when the number of capacitors in the circuit is the same, the gain gears of the passive gain adjustment circuit in the embodiment of the present invention are more than those of the passive gain adjustment circuit in the prior art, and the larger the m value, the greater the difference in the number of gain gears between the two. In addition, by adjusting the passive gain adjustment circuit in the embodiment of the present invention to the minimum gain, the signal attenuation can be increased, thereby increasing the input amplitude of the large signal. Therefore, the passive gain adjustment circuit in the embodiment of the present invention can be applied to gain adjustment scenarios with large dynamic range and large attenuation.

[0072] The passive gain adjustment circuit provided in an embodiment of the present invention addresses the defects existing in the prior art. By utilizing the termination switching of the dual-switched capacitor plates of the adjustment unit to switch the switch states of the first switch and the second switch, the number of capacitors connected to the ground terminal is increased, thereby significantly increasing the gain adjustment dynamic range of the adjustment unit. This can increase the number of gain levels of the circuit, enhance signal attenuation, and improve the amplitude of large signal input. Furthermore, when the gain adjustment dynamic range is constant, the number of switched capacitor arrays can be significantly reduced, thereby improving the integration density of the integrated circuit layout.

[0073] Figure 3 This is the second circuit diagram of the passive gain adjustment circuit provided by the embodiment of the present invention, such as Figure 3 As shown, the passive gain adjustment circuit further includes: a feedback controller 5;

[0074] The adjustment unit 2 performs passive gain adjustment on the second RF signal input from the input terminal 3 to obtain a second modulated signal, and sends the second modulated signal to the feedback controller 5 through the output terminal 4, wherein the second RF signal is a previous RF signal of the first RF signal;

[0075] The feedback controller 5 generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit 2;

[0076] The adjustment unit 2 performs gain adjustment based on the gain adjustment signal, and performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal.

[0077] Specifically, the gain adjustment signal described in the present invention refers to a control signal generated based on the detection result of the feedback controller on the second modulation signal, which is used to control the adjustment unit to perform adaptive gain adjustment so that the amplitude of the modulation signal output by the adjustment unit remains within the same standard range.

[0078] The gain gear adjustment described in the present invention refers to the gear adjustment of the gain output by the adjustment unit based on the gain adjustment signal. Different gain gears correspond to different output gains. By adjusting the gain gear, the adjustment unit can output the required gain.

[0079] In an embodiment of the present invention, a feedback controller is used to generate a gain adjustment signal and send the gain adjustment signal to an adjustment unit. The gain adjustment signal controls the adjustment unit to adjust the gain gear, so that the adjustment unit can use different gains to amplify or reduce signals of different intensities, thereby maintaining the final output signal amplitude within the same standard range.

[0080] For example, when the input signal is 100mV, the gain of the adjustment unit is automatically adjusted to 10 times, and the output modulation signal voltage amplitude is 1V; when the input signal is 10mV, the gain of the adjustment unit will be automatically adjusted to 100 times, and the output modulation signal voltage amplitude is still 1V.

[0081] In an embodiment of the present invention, the second RF signal is the RF signal preceding the first RF signal. That is, the adjustment unit first performs passive gain adjustment on the second RF signal inputted at the input terminal to obtain a second modulated signal. It should be noted that the passive gain adjustment performed by the adjustment unit is based on the circuit's current, unadjusted gain level or the circuit's default gain level, in preparation for passive gain adjustment of the next RF signal, i.e., the first RF signal.

[0082] To this end, after obtaining the second modulated signal, the adjustment unit sends the second modulated signal to the feedback controller via the output terminal. The feedback controller detects the amplitude of the second modulated signal to generate a gain adjustment signal, and feeds the gain adjustment signal back to the adjustment unit. The adjustment unit then adjusts the gain level based on the received gain adjustment signal, and obtains the adjustment unit after the gain level is adjusted by adjusting the switching states of the first switch and the second switch. When the next RF signal, i.e., the first RF signal, is input from the input terminal to the adjustment unit after the gain level is adjusted, the adjustment unit performs passive gain adjustment on the first RF signal, so that the signal output from the output terminal maintains the same amplitude standard, thereby obtaining the first modulated signal.

[0083] The circuit of the embodiment of the present invention adds a feedback controller to detect the modulated signal output by the adjustment unit, generates a gain adjustment signal and feeds it back to the adjustment unit, so that the adjustment unit can use different gains to amplify signals of different intensities, and the final output amplitude of the signal is maintained at the same standard, thereby achieving the purpose of automatic gain control.

[0084] Optionally, the adjustment unit is specifically configured to:

[0085] Adjusting the switch states of the first switch and the second switch according to the gain adjustment signal to determine a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal;

[0086] According to the first capacitor and the second capacitor, passive gain adjustment is performed on the first radio frequency signal inputted from the input end to obtain the first modulated signal.

[0087] Specifically, the first capacitor described in the present invention is a capacitor in a dual-switch capacitor sub-unit that is conductively connected to the input end. At this time, according to the gain adjustment signal, the adjustment unit adjusts the first switch and the second switch in the dual-switch capacitor sub-unit corresponding to each first capacitor, so that the first switch of the dual-switch capacitor sub-unit is in a closed state and the second switch is in an open state.

[0088] The second capacitor described in the present invention is a capacitor in a dual-switch capacitor subunit that is conductively connected to the ground terminal. At this time, according to the gain adjustment signal, the adjustment unit adjusts the first switch and the second switch of the dual-switch capacitor subunit corresponding to the second capacitor, so that the first switch of the dual-switch capacitor subunit is in an open state and the second switch is in a closed state.

[0089] Therefore, according to the gain adjustment signal fed back by the feedback controller, the adjustment unit can adjust the switching states of the first switch and the second switch in each dual-switch capacitor subunit to determine the first capacitor and the second capacitor in the adjustment unit after the gain level is adjusted.

[0090] Furthermore, from formula (4), it can be seen that the gain of the adjustment unit after the gain gear adjustment can be determined based on the sum of the capacitance values of the first capacitor and the second capacitor. Therefore, based on the first capacitor and the second capacitor, the first RF signal inputted at the input end can be passively gain adjusted to obtain a first modulated signal.

[0091] The circuit of the embodiment of the present invention adjusts the gain of the adjustment unit by setting the termination switching of the dual-switch capacitor plate, switching the switching state of the first switch and the second switch, adjusting the sum of the capacitance values of the capacitors connected to the input end and the sum of the capacitance values of the capacitors connected to the ground, changing the gain of the adjustment unit, and achieving gain gear adjustment of the adjustment unit.

[0092] Optionally, in each of the dual-switch capacitor sub-units, the capacitor model is a metal-insulator-metal capacitor or a metal-oxide-metal capacitor.

[0093] Specifically, the capacitor in each dual-switch capacitor subunit may be an on-chip capacitor, and its specific model may be a Metal-Insulator-Metal (MIM) capacitor or a Metal-Oxide-Metal (MOM) capacitor.

[0094] The circuit of the embodiment of the present invention selects appropriate capacitors based on the models of on-chip capacitors commonly used in integrated circuits to ensure normal operation of the passive gain adjustment circuit.

[0095] Optionally, in each of the dual-switch capacitor subunits, the model of the first switch is a complementary metal oxide semiconductor switch or a metal oxide semiconductor switch, and the model of the second switch is a metal oxide semiconductor switch.

[0096] Specifically, based on the on-off principle of a metal oxide semiconductor (MOS) tube and the conduction characteristics of CMOS, PMOS, and NMOS tubes, and in combination with the connection relationship between the first switch, the second switch, the capacitor, and the ground terminal in the embodiment of the present invention, to ensure normal operation of the circuit, the second switch connected to the ground terminal in each dual-switch capacitor subunit can be an NMOS tube switch, so that the S pole of the NMOS tube switch is grounded; the first switch in the second switch-on path can be a complementary metal oxide semiconductor (CMOS) tube switch or an NMOS tube switch, so that the input terminal of the MOS tube switch is connected to the input terminal of the passive gain adjustment circuit.

[0097] The circuit of the embodiment of the present invention selects a suitable type of switch tube based on the on-off principle of MOS tubes and the conduction characteristics of CMOS, PMOS, and NMOS tubes according to the connection position of the first switch and the second switch in the circuit to ensure the normal operation of the passive gain adjustment circuit.

[0098] The passive gain adjustment method provided by the present invention is described below. The passive gain adjustment method described below is implemented based on the passive gain adjustment circuit described above.

[0099] Figure 4 FIG. 1 is a flow chart of a passive gain adjustment method provided by an embodiment of the present invention. Figure 4 Shown, including:

[0100] Step S1, the input end receives a first radio frequency signal and sends the first radio frequency signal to the adjustment unit;

[0101] Step S2, the adjustment unit performs passive gain adjustment on the first RF signal to obtain a first modulated signal, and sends the first modulated signal to the output end;

[0102] Step S3: the output end outputs the first modulated signal.

[0103] The passive gain adjustment method provided by the present invention utilizes the termination switching of the dual-switched capacitor plates of the adjustment unit to switch the switch states of the first switch and the second switch, thereby increasing the number of capacitors connected to the ground terminal, thereby greatly increasing the gain adjustment dynamic range of the adjustment unit. This can increase the number of gain levels of the circuit, enhance signal attenuation, and improve the amplitude of large signal input. Furthermore, under the condition of a certain gain adjustment dynamic range, the number of switched capacitor arrays can be greatly reduced, thereby improving the integration of the integrated circuit layout.

[0104] Optionally, before sending the first modulated signal to the output end, the method further includes:

[0105] The adjustment unit performs passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and sends the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal;

[0106] The feedback controller generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit;

[0107] The adjustment unit performs gain adjustment based on the gain adjustment signal, and performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal.

[0108] Optionally, the adjustment unit performs gain adjustment based on the gain adjustment signal, and the adjustment unit performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal, including:

[0109] The adjustment unit adjusts the switch states of the first switch and the second switch according to the gain adjustment signal, and determines a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal;

[0110] The gain-level-adjusted adjustment unit performs passive gain adjustment on the first radio frequency signal input from the input end according to the first capacitor and the second capacitor to obtain the first modulated signal.

[0111] Figure 5 Schematic diagram of the structure of the passive gain adjustment device provided by the embodiment of the present invention. Figure 5 Shown, including:

[0112] An input module 510 is configured to receive a first radio frequency signal at an input end and send the first radio frequency signal to an adjustment unit;

[0113] A first adjustment module 520, configured for the adjustment unit to perform passive gain adjustment on the first RF signal to obtain a first modulated signal, and to send the first modulated signal to an output end;

[0114] The output module 530 is configured to output the first modulated signal at the output end.

[0115] Optionally, the device further includes:

[0116] a sending module, configured for the adjustment unit to perform passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and to send the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal;

[0117] a feedback module, configured for the feedback controller to generate a gain adjustment signal based on the second modulation signal, and send the gain adjustment signal to the adjustment unit;

[0118] The second adjustment module is used for the adjustment unit to perform gain adjustment based on the gain adjustment signal, and the adjustment unit performs passive gain adjustment on the first RF signal based on the adjusted gain level to obtain the first modulated signal.

[0119] Optionally, the second adjustment module is further configured to:

[0120] The adjustment unit adjusts the switch states of the first switch and the second switch according to the gain adjustment signal, and determines a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal;

[0121] The gain-level-adjusted adjustment unit performs passive gain adjustment on the first radio frequency signal input from the input end according to the first capacitor and the second capacitor to obtain the first modulated signal.

[0122] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the passive gain adjustment method provided by the above methods, and the method includes: the input end receives a first radio frequency signal and sends the first radio frequency signal to the adjustment unit; the adjustment unit performs passive gain adjustment on the first radio frequency signal to obtain a first modulated signal, and sends the first modulated signal to the output end; the output end outputs the first modulated signal.

[0123] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the passive gain adjustment method provided by the above methods, the method comprising: the input end receives a first radio frequency signal and sends the first radio frequency signal to the adjustment unit; the adjustment unit performs passive gain adjustment on the first radio frequency signal to obtain a first modulated signal, and sends the first modulated signal to the output end; the output end outputs the first modulated signal.

[0124] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0125] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A passive gain adjustment circuit, characterized in that: include: Input terminal, output terminal and adjustment unit; Wherein, the adjustment unit includes m dual-switch capacitor sub-units, where m is a positive integer; Each of the dual-switch capacitor subunits includes a first switch, a second switch, and a capacitor, one end of the first switch is commonly connected to one end of the second switch and one end of the capacitor, the other end of the first switch is connected to the input end, the other end of the second switch is grounded, and the other end of the capacitor is connected to the output end; wherein, among the m dual-switch capacitor subunits, the capacitance values of the first m-1 capacitors decrease in sequence, and the capacitance value of the mth capacitor is set according to the gain range requirement to achieve a large gain adjustment range; The adjustment unit is configured to perform passive gain adjustment on the first radio frequency signal inputted from the input end to obtain a first modulated signal; The adjustment unit is specifically used for: Adjusting the switch states of the first switch and the second switch according to the gain adjustment signal, and determining a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal; According to the first capacitor and the second capacitor, passive gain adjustment is performed on the first radio frequency signal inputted from the input end to obtain a first modulated signal.

2. The passive gain adjustment circuit according to claim 1, wherein: The circuit further includes: a feedback controller; The adjustment unit performs passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and sends the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal; The feedback controller generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit.

3. The passive gain adjustment circuit according to claim 1, wherein: In each of the dual-switch capacitor subunits, the capacitor model is a metal-insulator-metal capacitor or a metal-oxide-metal capacitor.

4. The passive gain adjustment circuit according to claim 1, wherein: In each of the dual-switch capacitor subunits, the first switch is a complementary metal oxide semiconductor switch or a metal oxide semiconductor switch, and the second switch is a metal oxide semiconductor switch.

5. A passive gain adjustment method applied to the passive gain adjustment circuit according to any one of claims 1 to 4, characterized in that: include: The input end receives a first radio frequency signal and sends the first radio frequency signal to the adjustment unit; The adjustment unit performs passive gain adjustment on the first radio frequency signal to obtain a first modulated signal, and sends the first modulated signal to the output end; The output end outputs the first modulated signal; The adjusting unit performs passive gain adjustment on the first radio frequency signal to obtain a first modulated signal, including: The adjustment unit adjusts the switch states of the first switch and the second switch according to the gain adjustment signal, and determines a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal; The gain-level-adjusted adjustment unit performs passive gain adjustment on the first radio frequency signal input from the input end according to the first capacitor and the second capacitor to obtain the first modulated signal.

6. The passive gain adjustment method according to claim 5, characterized in that: Before sending the first modulated signal to the output end, the method further includes: The adjustment unit performs passive gain adjustment on the second RF signal input from the input end to obtain a second modulated signal, and sends the second modulated signal to the feedback controller through the output end, wherein the second RF signal is a previous RF signal of the first RF signal; The feedback controller generates a gain adjustment signal based on the second modulation signal, and sends the gain adjustment signal to the adjustment unit.

7. A passive gain adjustment device, characterized in that: include: An input module, configured to receive a first radio frequency signal at an input end and send the first radio frequency signal to an adjustment unit; wherein the adjustment unit includes m dual-switch capacitor subunits, where m is a positive integer; Each of the dual-switch capacitor subunits includes a first switch, a second switch, and a capacitor, one end of the first switch is commonly connected to one end of the second switch and one end of the capacitor, the other end of the first switch is connected to the input end, the other end of the second switch is grounded, and the other end of the capacitor is connected to the output end; wherein, among the m dual-switch capacitor subunits, the capacitance values of the first m-1 capacitors decrease in sequence, and the capacitance value of the mth capacitor is set according to the gain range requirement to achieve a large gain adjustment range; a first adjustment module, configured for the adjustment unit to perform passive gain adjustment on the first RF signal to obtain a first modulated signal, and to send the first modulated signal to an output end; An output module, configured to output the first modulated signal at the output end; The first adjustment module includes: Adjusting the switch states of the first switch and the second switch according to the gain adjustment signal, and determining a first capacitor and a second capacitor in the adjustment unit after the gain level adjustment, wherein the first capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the input terminal, and the second capacitor is a capacitor in the dual-switch capacitor subunit that is conductively connected to the ground terminal; According to the first capacitor and the second capacitor, passive gain adjustment is performed on the first radio frequency signal inputted from the input end to obtain a first modulated signal.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the passive gain adjustment method according to any one of claims 5 to 6 are implemented.

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