Integrating Circuit and Signal Processing Module

Abstract

The present disclosure provides an integrating circuit and a signal processing module. The integrating circuit comprises an operational amplifier; an integrating capacitor, coupled to an output terminal and a first input terminal of the operational amplifier; and an adjustable resistance module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit. The adjustable resistance module receives a plurality of first control signals, to adjust a resistance value of the adjustable resistance module. The present disclosure may realize the noise brought by sidelobe to enhance the SNR, and reduce the power consumption and complexity of the overall circuit.

What is claimed is: 
     
         1 . An integrating circuit, comprising:
 a first operational amplifier;   an integrating capacitor or an adjustable integrating capacitor module, coupled between an output terminal and a first input terminal of the operational amplifier; and   an adjustable resistance module and/or a switched-capacitor module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the switched-capacitor module comprises an adjustable capacitance module, and the adjustable resistance module is configured to receive a plurality of first control signals, to adjust a resistance value of the adjustable resistance module, and/or the adjustable capacitance module is configured to receive a plurality of second control signals, to adjust a capacitance value between a first terminal and a second terminal of the adjustable capacitance module.   
     
     
         2 . The integrating circuit of  claim 1 , wherein the adjustable resistance module comprises a plurality of resistor-selecting units controlled by the plurality of first control signals respectively, and each resistor-selecting unit comprises:
 a resistor; and   a resistance-control switch, coupled to the resistor.   
     
     
         3 . The integrating circuit of  claim 2 , wherein the plurality of resistor-selecting units are connected to each other in parallel, and the resistor and the resistance-control switch of each resistor-selecting unit are connected to each other in series. 
     
     
         4 . The integrating circuit of  claim 2 , wherein the plurality of resistor-selecting units are connected to each other in series, and the resistor and the resistance-control switch of each resistor-selecting unit are connected to each other in parallel. 
     
     
         5 . The integrating circuit of  claim 1 , wherein the switched-capacitor module further comprises:
 a first switch, coupled between the first terminal of the adjustable capacitance module and the integrating input terminal;   a second switch, coupled between the first terminal of the adjustable capacitance module and a ground;   a third switch, coupled between the second terminal of the adjustable capacitance module and the first input terminal of the operational amplifier; and   a fourth switch, coupled between the second terminal of the adjustable capacitance module and the ground.   
     
     
         6 . The integrating circuit of  claim 5 , wherein the adjustable capacitance module comprises a plurality of capacitor-selecting units controlled by the plurality of second control signals respectively, to adjust the capacitance value of the adjustable capacitance module, and each capacitor-selecting unit comprises:
 a capacitor; and   a capacitance-control switch, coupled to the capacitor.   
     
     
         7 . The integrating circuit of  claim 6 , wherein the plurality of capacitor-selecting units are connected to each other in parallel, the capacitor and the capacitance-control switch of each capacitor-selecting unit are connected to each other in series; or wherein the plurality of capacitor-selecting units are connected to each other in series, the capacitor and the capacitance-control switch of each capacitor-selecting unit are connected to each other in parallel. 
     
     
         8 . The integrating circuit of  claim 5 , wherein the switched-capacitor module further comprises:
 at least a resistor unit, coupled between the first switch and the third switch.   
     
     
         9 . A signal processing module, comprising:
 a switching mixer;   an analog-to-digital converter;   an integrating circuit, coupled between the switching mixer and the analog-to-digital converter, the integrating circuit comprises:
 an operational amplifier; 
 an integrating capacitor unit, coupled to an output terminal and a first input terminal of the operational amplifier; and 
 an adjustable module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the adjustable module is controlled by a plurality of signals, to adjust a resistance value or a capacitance value of the adjustable module. 
   
     
     
         10 . The signal processing module of  claim 9 , wherein the adjustable module comprises an adjustable resistance module, and the adjustable resistance module is configured to receive a plurality of first control signals, to adjust the resistance value of the adjustable resistance module. 
     
     
         11 . The signal processing module of  claim 10 , wherein the adjustable resistance module comprises a plurality of resistor-selecting units controlled by the plurality of first control signals respectively, and each resistor-selecting unit comprises:
 a resistor; and   a resistance-control switch, coupled to the resistor.   
     
     
         12 . The signal processing module of  claim 11 , wherein the plurality of resistor-selecting units are connected to each other in parallel, and the resistor and the resistance-control switch of each resistor-selecting unit are connected to each other in series signal; or wherein the plurality of resistor-selecting units are connected to each other in series, and the resistor and the resistance-control switch of each resistor-selecting unit are connected to each other in parallel. 
     
     
         13 . The signal processing module of  claim 9 , wherein the adjustable module comprises a switched-capacitor module, coupled between the first input terminal of the operational amplifier and the integrating input terminal of the integrating circuit, and the switched-capacitor module comprises:
 an adjustable capacitance module, configured to receive a plurality of second control signals, to adjust a capacitance value between a first terminal and a second terminal of the adjustable capacitance module;   a first switch, coupled between the first terminal and the integrating input terminal;   a second switch, coupled between the first terminal and a ground;   a third switch, coupled between the second terminal and the first input terminal of the operational amplifier; and   a fourth switch, coupled between the second terminal and the ground.   
     
     
         14 . The signal processing module of  claim 13 , wherein the adjustable capacitance module comprises a plurality of capacitor-selecting units controlled by the plurality of second control signals respectively, and each capacitor-selecting unit comprises:
 a capacitor; and   a capacitance-control switch, coupled to the capacitor.   
     
     
         15 . The signal processing module of  claim 14 , wherein the plurality of capacitor-selecting units are connected to each other in parallel, the capacitor and the capacitance-control switch of each capacitor-selecting unit are connected to each other in series signal; or wherein the plurality of capacitor-selecting units are connected to each other in series, the capacitor and the capacitance-control switch of each capacitor-selecting unit are connected to each other in parallel. 
     
     
         16 . The signal processing module of  claim 13 , wherein the switched-capacitor module further comprises:
 at least a resistor unit, coupled between the first switch and the third switch.   
     
     
         17 . An integrating circuit, comprising:
 a first operational amplifier;   an adjustable integrating capacitor module, coupled between a first input terminal and an output terminal of the first operational amplifier, wherein the adjustable integrating capacitor module comprises a plurality of integrating-capacitor-selecting units, and each integrating-capacitor-selecting unit comprises an integrating capacitor and at least a switch; and   a voltage following module, coupled to the plurality of integrating-capacitor-selecting units of the adjustable integrating capacitor module;   wherein the adjustable integrating capacitor module is configured to receive a plurality of control signals, to adjust a capacitance value between the first input terminal and the output terminal.   
     
     
         18 . The integrating circuit of  claim 17 , wherein the voltage following module comprises a plurality of nodes, and the plurality of nodes are electrically connected to the integrating capacitors of the plurality of integrating-capacitor-selecting units, respectively. 
     
     
         19 . The integrating circuit of  claim 18 , wherein the voltage following module comprises a voltage following circuit, and each node of the plurality of nodes is coupled to an input terminal of the voltage following circuit through a first switch and coupled to an output terminal of the voltage following circuit through a second switch. 
     
     
         20 . The integrating circuit of  claim 19 , wherein the voltage following circuit comprises a second operational amplifier, wherein a first input terminal of the second operational amplifier is electrically connected to an output terminal of the second operational amplifier, a second input terminal of the second operational amplifier is the input terminal of the voltage following circuit, and an output terminal of the second operational amplifier is the output terminal of the voltage following circuit. 
     
     
         21 . The integrating circuit of  claim 17 , wherein the plurality of integrating-capacitor-selecting units are connected to each other in parallel or in series.