Switch-capacitor integrator

Abstract

The invention discloses a switch-capacitor integrator adopting novel C-class inverters and a switch-capacitor integrator realizing form of a pseudodifferential structure. The switch-capacitor integrator in a pseudodifferential structure comprises two novel C-class inverters (60) and capacitors such as a sampling capacitor CS, a compensation capacitor CC, an integrating capacitor CI, and the like, switches such as an NMOS switch S2, an NMOS switch S4, an NMOS switch S7, an NMOS switch S8, a CMOS switch S3, a CMOS switch S5, a bootstrap NMOS switch S1, a bootstrap NMOS switch S6, a bootstrap NMOS switch S9, and the like and a common mode feedback circuit (61) in the prior art, wherein the two novel C-class inverters (60) are respectively positioned in a positive branch and a negative branch of the integrator and differentially symmetrized to be in the pseudodifferential structure. The invention overcomes the effects of indexes of working efficiency, establishing time, integrating accuracy, power consumption, and the like on the switch-capacitor integrator by technical deviation through the bulk potential modulation effect of a bulk potential modulator in the novel C-class inverters and greatly improves the stability and the robustness of the integrator without obviously increasing the power consumption.

Description

technical field [0001] The invention relates to a switched capacitor integrator and a switched capacitor integrator with a pseudo-differential structure, belonging to the technical field of integrated circuits. Background technique [0002] In recent years, with the rapid development of informatization construction, signal and information processing has widely penetrated into various fields of scientific research, technological development, industrial production, national defense and national economy, and has become an important driving force for global economic and social development. Because of this, the design of signal processing chips has become a research hotspot for integrated circuit designers. In order to meet the needs of battery-driven portable devices and the energy-saving needs of large-scale systems, signal processing chips need to continue to move towards lower voltage, lower power consumption, and lower cost while ensuring high performance. [0003] Integrat...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a switched capacitor integrator using a new class C inverter to overcome the fact that the transconductance of the class C inverter in the switched capacitor integrator of the prior art is greatly affected by the process deviation Large (especially when the size of the MOS tube is large), which leads to inaccurate charge sampling and transmission when the integrator works in the sampling phase or maintaining the phase, and the operating frequency and power consumption are extremely unstable; The deterioration of indicators such as accuracy and dynamic power consumption may eventually lead to insufficient integrator performance degradation or even loss of function

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