Control circuit and method based on polyphase filter

Abstract

The invention provides a control circuit and method based on a multiphase filter, the circuit comprises a decoder, a process calibration module and multiple stages of RC PPF circuits, and each stage of RC PPF circuit comprises a resistor array and a capacitor array; the resistor array comprises m + 1 resistors and m + 1 switches, and the capacitor array comprises n + 1 capacitors and n + 1 switches; after the working frequency band code word of the RC PPF circuit is determined, the decoder outputs a corresponding frequency band control code word; controlling m + 1 switches in the resistor array according to the frequency band control code word, and adjusting the working frequency point of each level of RC PPF circuit; when the enable signal is valid, the process calibration module outputs a corresponding process calibration code word; controlling n + 1 switches of the capacitor array according to the process calibration code word; the multi-phase filter not only can adjust the bandwidth frequency band, but also can calibrate the mismatch of the resistor and the capacitor at different process corners, thereby greatly reducing the frequency point deviation of the multi-phase filter caused by the fluctuation of the process corners.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a control circuit and method based on a polyphase filter. Background Art

[0002] In a RF transceiver using a zero-IF architecture, the input signal of the mixer needs to be an orthogonal signal to eliminate the image signal suppression problem. The orthogonal signal generator is an RC polyphase filter, which converts the differential signal of two inputs into four output orthogonal signals.

[0003] Single-stage RC multiphase filters generally include fixed resistors and capacitors, usually generating ideal orthogonal signals at a single frequency point, and have a narrow operating bandwidth. The frequency point of the ideal orthogonal single-stage multiphase filter is strongly related to its own resistance and capacitance values, and the resistance and capacitance values ​​fluctuate greatly with the process, generally within + / -20%, which causes the operating frequency point of the RC multiphase filter to fluctuate more, at least + / -30%. In addition, the resistance and capacitance of the multiphase filter are generally fixed, and the operating bandwidth cannot be flexibly adjusted for different application scenarios. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a control circuit and method based on a multi-phase filter, which can not only adjust the bandwidth frequency band, but also calibrate the mismatch of resistors and capacitors at different process angles, thereby greatly reducing the frequency deviation of the multi-phase filter caused by process angle fluctuations.

[0005] In a first aspect, an embodiment of the present invention provides a control circuit and method based on a polyphase filter, wherein the circuit includes a decoder, a process calibration module, and a multi-stage RC PPF circuit, wherein each stage of the RC PPF circuit includes a resistor array and a capacitor array; the resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches;

[0006] The decoder is used to output a corresponding frequency band control code word after the working frequency band code word of the RC PPF circuit is determined; control the m+1 switches in the resistor array according to the frequency band control code word to adjust the working frequency point of each level of the RCPPF circuit;

[0007] The process calibration module is used to output a corresponding process calibration code word when the enable signal is valid; and control the n+1 switches of the capacitor array according to the process calibration code word.

[0008] Further, the multi-stage RC PPF circuit includes a first-stage RC PPF circuit and a second-stage RC PPF circuit, the first-stage RC PPF circuit includes a first resistor array and a first capacitor array, and the second-stage RC PPF circuit includes a second resistor array and a second capacitor array;

[0009] The first resistor array includes m+1 first resistors and m+1 first switches, and the first capacitor array includes n+1 first capacitors and n+1 second switches;

[0010] The second resistor array includes m+1 second resistors and m+1 third switches, and the second capacitor array includes n+1 second capacitors and n+1 fourth switches.

[0011] Further, the first port of the first resistor array is connected to each of the first resistors, and is connected to the second port of the first resistor array after passing through each of the first switches;

[0012] The third port of the first capacitor array is connected to each of the first capacitors and connected to the fourth port of the first capacitor array after passing through each of the second switches.

[0013] Further, the fifth port of the second resistor array is connected to each of the second resistors, and connected to the sixth port of the second resistor array after passing through each of the third switches;

[0014] The seventh port of the second capacitor array is connected to each of the second capacitors and connected to the eighth port of the second capacitor array after passing through each of the fourth switches.

[0015] Further, the decoder is used to output a first frequency band control codeword and a second frequency band control codeword respectively after the first working frequency band codeword of the first-stage RC PPF circuit and the second working frequency band codeword of the second-stage RC PPF circuit are determined;

[0016] Control m+1 of the first switches in the first resistor array according to the first frequency band control codeword to adjust the operating frequency of the first-stage RC PPF circuit;

[0017] And controlling the m+1 third switches in the second resistor array according to the second frequency band control codeword to adjust the operating frequency of the second-stage RC PPF circuit.

[0018] Further, the process calibration module is used to control n+1 of the second switches in the first capacitor array according to the process calibration codeword to compensate for a first deviation of resistance and capacitance values ​​of the first-stage RC PPF circuit at the SS corner or the FF corner;

[0019] And controlling the n+1 fourth switches in the second capacitor array according to the process calibration codeword to compensate for a second deviation of the resistance and capacitance values ​​of the second-stage RC PPF circuit at the SS corner or the FF corner.

[0020] Furthermore, the operating frequency of the first-stage RC PPF circuit is calculated in the following manner:

[0021]

[0022] Among them, f1 is the operating frequency of the first-stage RC PPF circuit, R1 is the equivalent resistance of the first resistor array, and C1 is the equivalent capacitance of the first resistor array; when C1 remains unchanged, the value of R1 is adjusted by the first frequency band control codeword.

[0023] In a second aspect, an embodiment of the present invention provides a control method based on a polyphase filter, which is applied to a control circuit based on a polyphase filter as described above, wherein the circuit includes a decoder, a process calibration module, and a multi-stage RC PPF circuit, wherein each stage of the RC PPF circuit includes a resistor array and a capacitor array; the resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches; the method includes:

[0024] When the working frequency band codeword of the RC PPF circuit is determined, the decoder outputs the corresponding frequency band control codeword;

[0025] Control the m+1 switches in the resistor array according to the frequency band control codeword to adjust the operating frequency of each level of the RCPPF circuit;

[0026] When the enable signal is valid, the process calibration module outputs the corresponding process calibration codeword;

[0027] The n+1 switches of the capacitor array are controlled according to the process calibration codeword.

[0028] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method described above when executing the computer program.

[0029] In a fourth aspect, an embodiment of the present invention provides a computer-readable medium having a non-volatile program code executable by a processor, wherein the program code enables the processor to execute the method as described above.

[0030] The embodiment of the present invention provides a control circuit and method based on a polyphase filter. The circuit includes a decoder, a process calibration module and a multi-stage RC PPF circuit. Each stage of the RC PPF circuit includes a resistor array and a capacitor array. The resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches. When the working frequency band codeword of the RC PPF circuit is determined, the decoder outputs the corresponding frequency band control codeword. The m+1 switches in the resistor array are controlled according to the frequency band control codeword to adjust the working frequency of each stage of the RC PPF circuit. When an enable signal is valid, the process calibration module outputs the corresponding process calibration codeword. The n+1 switches of the capacitor array are controlled according to the process calibration codeword. Not only can the bandwidth frequency band be adjusted, but also the mismatch of resistors and capacitors under different process angles can be calibrated, thereby greatly reducing the frequency deviation of the polyphase filter caused by process angle fluctuations.

[0031] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of a control circuit based on a polyphase filter provided in Embodiment 1 of the present invention;

[0035] Figure 2 A schematic diagram of the structure of a control circuit based on a polyphase filter provided in Embodiment 1 of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a first resistor array provided in Embodiment 1 of the present invention;

[0037] Figure 4A schematic diagram of the structure of a first capacitor array provided in Embodiment 1 of the present invention;

[0038] Figure 5 A schematic diagram of the structure of a second resistor array provided in the first embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of a second capacitor array provided in Embodiment 1 of the present invention;

[0040] Figure 7 This is a flow chart of a control method based on a polyphase filter provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0043] Embodiment 1:

[0044] Figure 1 This is a schematic diagram of a control circuit based on a polyphase filter provided in Embodiment 1 of the present invention.

[0045] Reference Figure 1 , the circuit includes a decoder (sub-circuit A), a process calibration module (sub-circuit B) and a multi-stage RC PPF circuit (sub-circuit C), each stage of the RC PPF circuit includes a resistor array and a capacitor array; the resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches;

[0046] The decoder is used to output the corresponding frequency band control code word after the working frequency band code word of the RC PPF circuit is determined; and control the m+1 switches in the resistor array according to the frequency band control code word to adjust the working frequency point of each stage of the RC PPF circuit;

[0047] The process calibration module is used to output a corresponding process calibration code word when the enable signal is valid; and control n+1 switches of the capacitor array according to the process calibration code word.

[0048] Here, the present application introduces additional poles by cascading multi-stage RC PPF (Poly Phase Filter) circuits to generate ideal orthogonal signals at multiple frequency points, thereby expanding the working bandwidth.

[0049] Specifically, when the working frequency code word R1 of the RC PPF circuit <x:0> 、R2 <y:0>After confirmation, the decoder outputs the corresponding frequency band control codeword R1code <m:0>、R2code <m:0>,R1code <m:0>Respectively control the switches SW1_0 to SW1_m in the first resistor array RES1, R2code <m:0>The switches SW2_0 ˜ SW2_m in the second resistor array RES2 are controlled respectively.

[0050] When the enable signal RCcal_EN of the process calibration module (sub-circuit B) is valid, the process calibration module outputs the process calibration codeword RCcal <n:0>,RCcal <n:0>They are used to control switches SW3_0 ~ SW3_n and SW4_0 ~ SW4_n in the first capacitor array CAP1 and the second capacitor array CAP2 respectively.

[0051] Compared with the prior art, the circuit structure of the present application produces a bandwidth-adjustable, process-insensitive RC multiphase filter, which can be adjusted by adjusting the codeword R1code of the resistor array. <m:0>、R2code <m:0>, the frequency band of PPF operation can be adjusted; the codeword RCcal output by the process calibration module <n:0>, the fluctuation of resistance and capacitance values ​​under different process angles is greatly reduced, thereby ensuring that the PPF is insensitive to the process and the operating frequency band is stable under different process angles.

[0052] Further, see Figure 2 , the multi-stage RC PPF circuit (sub-circuit C) includes a first-stage RC PPF circuit and a second-stage RC PPF circuit, the first-stage RC PPF circuit includes a first resistor array (sub-circuit D) and a first capacitor array (sub-circuit F), and the second-stage RC PPF circuit includes a second resistor array (sub-circuit E) and a second capacitor array (sub-circuit G);

[0053] The first resistor array includes m+1 first resistors and m+1 first switches, and the first capacitor array includes n+1 first capacitors and n+1 second switches;

[0054] The second resistor array includes m+1 second resistors and m+1 third switches, and the second capacitor array includes n+1 second capacitors and n+1 fourth switches.

[0055] Specifically, when the working frequency band codeword of the RC PPF circuit is determined, the frequency band control codeword R1 <x:0> 、R2 <y:0>The decoder (sub-circuit A) generates the control code word R1code <m:0>and R2code <m:0>; When the enable signal RCcal_EN of the process calibration module is valid, the process calibration module (sub-circuit B) generates the process calibration codeword RCcal <n:0>.

[0056] Further, the first port R1_P of the first resistor array RES1 is connected to each first resistor, and is connected to the second port R1_N of the first resistor array after passing through each first switch;

[0057] The third port C1_P of the first capacitor array is connected to each first capacitor, and is connected to the fourth port C1_N of the first capacitor array after passing through each second switch.

[0058] Specifically, refer to Figure 3 and Figure 4 , the first resistor array RES1 includes first resistors R1_0 to R1_m and first switches SW1_0 to SW1_m, the first port R1_P of the first resistor array is connected to the first resistors R1_0 to R1_m, and is connected to the second port R1_N after passing through the first switches SW1_0 to SW1_m;

[0059] The first capacitor array CAP1 includes first capacitors C1_0 ˜ C1_n and second switches SW3_0 ˜ SW3_n. The third port C1_P of the first capacitor array is connected to the first capacitors C1_0 ˜ C1_n and connected to the fourth port C1_N after passing through the second switches SW3_0 ˜ SW3_n.

[0060] Further, the fifth port R2_P of the second resistor array RES2 is connected to each second resistor, and is connected to the sixth port R2_N of the second resistor array after passing through each third switch;

[0061] The seventh port C2_P of the second capacitor array is connected to each second capacitor, and is connected to the eighth port C2_N of the second capacitor array after passing through each fourth switch.

[0062] Specifically, refer to Figure 5 and Figure 6 , the second resistor array RES2 includes second resistors R2_0 to R2_m and third switches SW2_0 to SW2_m, the fifth port R2_P of the second resistor array is connected to the second resistors R2_0 to R2_m, and is connected to the sixth port R2_N after passing through the third switches SW2_0 to SW2_m;

[0063] The second capacitor array CAP2 includes second capacitors C2_0 ˜ C2_n and fourth switches SW4_0 ˜ SW4_n. The seventh port C2_P of the second capacitor array is connected to the second capacitors C2_0 ˜ C2_n and connected to the eighth port C2_N after passing through the fourth switches SW4_0 ˜ SW4_n.

[0064] Further, the decoder is used to output the first frequency band control codeword and the second frequency band control codeword respectively after the first working frequency band codeword of the first-stage RC PPF circuit and the second working frequency band codeword of the second-stage RC PPF circuit are determined;

[0065] Control m+1 first switches in the first resistor array according to the first frequency band control codeword to adjust the operating frequency of the first-stage RCPPF circuit;

[0066] And the m+1 third switches in the second resistor array are controlled according to the second frequency band control codeword to adjust the operating frequency of the second-stage RC PPF circuit.

[0067] Here, codeword R1code <0> ~R1code <m>The on and off of the first switches SW1_0 to SW1_m in the first resistor array RES1 are controlled respectively. In the first stage RC PPF circuit, the first stage RC PPF circuit includes a first resistor array RES2 and a first capacitor array CAP2. The frequency point f1 at which the amplitudes of the in-phase signal and the quadrature signal outputted by the first stage RC PPF circuit are equal is determined by formula (1).

[0068] The operating frequency of the first-stage RC PPF circuit is calculated as follows:

[0069]

[0070] Wherein, f1 is the operating frequency of the first-stage RC PPF circuit, R1 is the equivalent resistance of the first resistor array, and C1 is the equivalent capacitance of the first resistor array; when C1 remains unchanged, the value of R1 is adjusted by the first frequency band control codeword.

[0071] Here, by controlling the codeword R1code <0> ~R1code <m>By adjusting the value of the equivalent resistor R1, the frequency point f1 at which the amplitudes of the first-stage in-phase and quadrature signals are equal can be changed.

[0072] Similarly, in the second-stage RC PPF circuit, the second-stage RC PPF circuit includes a second resistor array RES2 and a second capacitor array CAP2, and the frequency point f2 at which the amplitudes of the in-phase signal and the quadrature signal outputted by the second-stage RC PPF circuit are equal is determined by formula (2):

[0073]

[0074] Wherein, R2 is the equivalent resistance of the second resistor array RES2, and C2 is the equivalent capacitance of the second capacitor array CAP2; when the equivalent capacitance C2 remains unchanged, the control code word R2code is used. <0> ~R2code <m>By adjusting the value of the equivalent resistor R2, the frequency point f2 at which the amplitudes of the in-phase and quadrature signals of the second-stage RC PPF circuit are equal can be changed.

[0075] Therefore, this application uses the control code word R1code <m:0>and R2code <m:0>, respectively adjust the frequency point f1 of the second-stage RCPPF circuit and the frequency point f2 of the second-stage RC PPF circuit, so that the bandwidth of the PPF can be adjusted.

[0076] Further, a process calibration module is used to control n+1 second switches in the first capacitor array according to the process calibration codeword to compensate for a first deviation of resistance and capacitance values ​​of the first-stage RC PPF circuit at the SS corner or the FF corner;

[0077] And controlling n+1 fourth switches in the second capacitor array according to the process calibration codeword to compensate for the second deviation of the resistance and capacitance values ​​of the second-stage RC PPF circuit at the SS corner or the FF corner.

[0078] Specifically, the process calibration codeword RCcal <0> ~RCcal <n>The on and off of the second switches SW3_0 - SW3_n in the first capacitor array CAP1 are controlled respectively to compensate for the first deviation of the resistance and capacitance values ​​at the SS corner or the FF corner.

[0079] Here, we take the process calibration under SS corner as an example. The equivalent values ​​of the first resistor array RES1 and the first capacitor array CAP1 under the typical TT corner are R1tt and C1tt, and the equivalent values ​​under the SS corner are R1ss and C1ss, respectively. The process calibration codeword RCcal <n:0>By adjusting the on and off of the second switches SW3_0 to SW3_n of the first capacitor array CAP1 under the SS corner, the equivalent capacitance of the first capacitor array CAP1 is C1ss_cal, and satisfies the following formula (3):

[0080]

[0081] The calibrated operating frequency f1_ss_cal of the first-stage RC PPF circuit in the SS corner is basically the same as the operating frequency f1_tt in the TT corner:

[0082]

[0083] Under the FF corner, the equivalent values ​​of the first resistor array RES1 and the first capacitor array CAP1 are R1ff and C1ff respectively, and the process calibration codeword RCcal <n:0>By adjusting the on and off of the second switches SW3_0 to SW3_n of the first capacitor array CAP1 under the FF corner, the equivalent capacitance value of the first capacitor array CAP1 is C1ff_cal and satisfies the following formula:

[0084]

[0085] The operating frequency f1_ff of the first-stage RC PPF circuit in the FF corner and the operating frequency f1_tt in the TT corner are also basically the same:

[0086]

[0087] Similarly, the process calibration codeword RCcal <0> ~RCcal <n>By controlling the on and off of the fourth switches SW4_0 - SW4_n in the second capacitor array CAP2 respectively, the second deviation of the resistance and capacitance values ​​of the second-stage RC PPF circuit at the SS corner or the FF corner can be compensated.

[0088] In summary, the first-stage RC PPF circuit and the second-stage RC PPF circuit adjust the frequency by changing the equivalent resistance value of each stage of the resistor array, and perform process calibration by changing the equivalent capacitance value of each stage of the capacitor array to ensure that the operating frequency is insensitive to process changes.

[0089] Embodiment 2:

[0090] Figure 7 This is a flow chart of a control method based on a polyphase filter provided in Embodiment 2 of the present invention.

[0091] Reference Figure 7 , applied to the control circuit based on the polyphase filter as described above, the circuit includes a decoder, a process calibration module and a multi-stage RC PPF circuit, each stage of the RC PPF circuit includes a resistor array and a capacitor array; the resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches; the method includes the following steps:

[0092] Step S101, when the working frequency band codeword of the RC PPF circuit is determined, the decoder outputs the corresponding frequency band control codeword;

[0093] Step S102, controlling m+1 switches in the resistor array according to the frequency band control codeword to adjust the operating frequency of each stage of the RC PPF circuit;

[0094] Step S103, when the enable signal is valid, the process calibration module outputs the corresponding process calibration codeword;

[0095] Step S104 , controlling n+1 switches of the capacitor array according to the process calibration codeword.

[0096] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the control method based on the polyphase filter provided in the above embodiment are implemented.

[0097] An embodiment of the present invention further provides a computer-readable medium having a non-volatile program code executable by a processor, wherein a computer program is stored on the computer-readable medium, and when the computer program is executed by the processor, the steps of the control method based on the polyphase filter of the above embodiment are executed.

[0098] The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0100] In addition, in the description of the embodiments of 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0102] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0103] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.< / n> < / n> < / m> < / m> < / m> < / x:0> < / x:0>

Claims

1. A control circuit based on a polyphase filter, characterized in that: The circuit includes a decoder, a process calibration module and a multi-stage RC PPF circuit, each stage of the RC PPF circuit includes a resistor array and a capacitor array; the resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches; The decoder is used to output a corresponding frequency band control code word after the working frequency band code word of the RC PPF circuit is determined; and control the m+1 switches in the resistor array according to the frequency band control code word to adjust the working frequency point of each stage of the RC PPF circuit; The process calibration module is used to output a corresponding process calibration code word when the enable signal is valid; and control the n+1 switches of the capacitor array according to the process calibration code word.

2. The control circuit based on the polyphase filter according to claim 1, characterized in that: The multi-stage RC PPF circuit includes a first-stage RC PPF circuit and a second-stage RC PPF circuit, the first-stage RC PPF circuit includes a first resistor array and a first capacitor array, and the second-stage RC PPF circuit includes a second resistor array and a second capacitor array; The first resistor array includes m+1 first resistors and m+1 first switches, and the first capacitor array includes n+1 first capacitors and n+1 second switches; The second resistor array includes m+1 second resistors and m+1 third switches, and the second capacitor array includes n+1 second capacitors and n+1 fourth switches.

3. The control circuit based on the polyphase filter according to claim 2, characterized in that: The first port of the first resistor array is connected to each of the first resistors and connected to the second port of the first resistor array after passing through each of the first switches; The third port of the first capacitor array is connected to each of the first capacitors and connected to the fourth port of the first capacitor array after passing through each of the second switches.

4. The control circuit based on the polyphase filter according to claim 2, characterized in that: The fifth port of the second resistor array is connected to each of the second resistors and connected to the sixth port of the second resistor array after passing through each of the third switches; The seventh port of the second capacitor array is connected to each of the second capacitors and connected to the eighth port of the second capacitor array after passing through each of the fourth switches.

5. The control circuit based on the polyphase filter according to claim 2, characterized in that: The decoder is used to output a first frequency band control codeword and a second frequency band control codeword respectively after the first working frequency band codeword of the first-stage RC PPF circuit and the second working frequency band codeword of the second-stage RC PPF circuit are determined; Control m+1 of the first switches in the first resistor array according to the first frequency band control codeword to adjust the operating frequency of the first-stage RC PPF circuit; And controlling the m+1 third switches in the second resistor array according to the second frequency band control codeword to adjust the operating frequency of the second-stage RC PPF circuit.

6. The control circuit based on the polyphase filter according to claim 2, characterized in that: The process calibration module is used to control n+1 of the second switches in the first capacitor array according to the process calibration codeword to compensate for a first deviation of resistance and capacitance values ​​of the first-stage RC PPF circuit at an SS corner or an FF corner; And controlling the n+1 fourth switches in the second capacitor array according to the process calibration codeword to compensate for a second deviation of the resistance and capacitance values ​​of the second-stage RC PPF circuit at the SS corner or the FF corner.

7. The control circuit based on the polyphase filter according to claim 5, characterized in that: The operating frequency of the first-stage RC PPF circuit is calculated as follows: Among them, f1 is the operating frequency of the first-stage RC PPF circuit, R1 is the equivalent resistance of the first resistor array, and C1 is the equivalent capacitance of the first resistor array; when C1 remains unchanged, the value of R1 is adjusted by the first frequency band control codeword.

8. A control method based on a polyphase filter, characterized in that: A control circuit based on a polyphase filter as claimed in any one of claims 1 to 7, wherein the circuit comprises a decoder, a process calibration module and a multi-stage RC PPF circuit, wherein each stage of the RC PPF circuit comprises a resistor array and a capacitor array; The resistor array includes m+1 resistors and m+1 switches, and the capacitor array includes n+1 capacitors and n+1 switches; the method includes: When the working frequency band codeword of the RC PPF circuit is determined, the decoder outputs the corresponding frequency band control codeword; Control the m+1 switches in the resistor array according to the frequency band control codeword to adjust the operating frequency of each stage of the RC PPF circuit; When the enable signal is valid, the process calibration module outputs the corresponding process calibration codeword; The n+1 switches of the capacitor array are controlled according to the process calibration codeword.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the method according to claim 8 is implemented.

10. A computer readable medium having a non-volatile program code executable by a processor, characterized in that: The program code causes the processor to execute the method of claim 8.

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