Switched capacitor integrator

Abstract

A switched capacitor integrator comprises: a dynamic amplifier which is used for amplifying an input signal and comprises an operational amplification module, two acceleration modules and a tail current bias module, wherein the operational amplification module is used for providing a predetermined amplification gain, the two acceleration modules are used for increasing the working current of the amplification module so as to increase the amplification speed of the operation amplification module, and the tail current bias module is used for providing bias current for the operational amplification module so as to determine a direct current working point of the amplification module; two switched capacitors which are respectively arranged at the positive input end and the negative input end ofthe operational amplification module and are used for inputting input signals to the operational amplification module; and two integrating capacitors which are respectively in bridge connection withthe positive input end and the negative output end and the negative input end and the positive output end of the operational amplification module and are used for realizing integration of input signals. According to the switched capacitor integrator provided by the invention, the establishment of the integrator can be accelerated on the premise of not damaging the linearity of the amplifier, and the establishment precision of the integrator is improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a switched capacitor integrator. Background technique [0002] Switched capacitor integrators are widely used in analog filters and analog-to-digital converters. Traditional switched capacitor integrators based on operational amplifiers have high power consumption, and dynamic amplifiers have no static power consumption. Their switching characteristics make them suitable for switched capacitor integrators. Integrator. However, the capacitive load of the ordinary dynamic amplifier in the amplification transfer phase will require the amplifier to consume more current in order to have enough transconductance to meet the establishment accuracy requirements, but it will damage the common mode characteristics of the dynamic amplifier and affect the linearity. It can be seen that there is a conflict between the settling accuracy of the switched capacitor integrator and the ...

AI Technical Summary

Problems solved by technology

However, the capacitive load of the ordinary dynamic amplifier in the amplification transfer phase will require the amplifier to consume more current in order to have enough transconductance to meet the establishment accuracy requirements, but it will damage the common mode characteristics of the dynamic amplifier and affect the linearity. It can be seen that there is a conflict between the settling accuracy of the switched capacitor integrator and the linearity of the amplifier

Images