Inverse integrator of lower-gain switch capacitance with non-sensitive parasitic effect and lower power consumption

Abstract

The invention discloses an inverse integrator of lower-gain switch capacitance with non-sensitive parasitic effect and lower power consumption, comprising a operation amplifier, an integration capacitance and a sample capacitance, the first end of the sample capacitance is connected with a switch communicated with an input voltage at the sample phase and another switch communicated with an input signal common mode voltage at the integration phase respectively, the second end of the sample capacitance is connected with the switch communicated with the input signal common mode voltage at the integration phase and a branch connected with the first input end of the operation amplifier, the branch is composed of a switch communicated at the sample phase and another switch communicated at the integration phase, which are connected in series, the first end of the third capacitance is connected between two switches in the branch, the second end of the third capacitance is connected with a switch communicated with the input signal common mode voltage at the sample phase and another switch communicated with the common mode voltage at the second input end of the operation amplifier at the integration phase respectively, the first end of the fourth capacitance is connected with the second end of the sample capacitance, the second end of the fourth capacitance is connected with the input signal common mode voltage. The inventive integrator has little gain coefficient and lower power consumption, and is non-sensitive to the capacitance parasitic effect.

Description

technical field [0001] The invention relates to the technical field of switched capacitor circuits, in particular to a small-gain switched capacitor inverting integrator which is insensitive to parasitic effects and low in power consumption. Background technique [0002] Switched capacitor integrators are widely used in various electronic signal processing systems, such as filters, data converters, and sensor networks. Under certain integrated circuit process technology conditions, the capacitance value is limited. For example, the capacitance value that can be accurately realized under the 0.35um process is 0.1pF, which greatly limits the realization of the small gain coefficient switched capacitor integrator. However, in some applications, it is necessary to use a switched capacitor integrator with small gain, such as Sigma-Delta data converter feedback coefficient and zero point optimization coefficient. Traditional switched capacitor integrators can generally achieve a ...

AI Technical Summary

Problems solved by technology

However, the improved switched-capacitor inverting integrator in the prior art requires the full cycle of the operational amplifier to operate normally

This technology also refers to the switched capacitor integrator of the T-type network, which can realize the switched capacitor integrator with small gain, and only needs half a cycle of the normal operation of the operational amplifier, but the switched capacitor integrator of the T-type network is sensitive to the capacitance parasitic effect

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