Transconductance-capacitor compensation circuit for rolling over network

Abstract

The invention relates to a turning network transconductor, namely a capacitance compensating circuit which comprises a main signal transconductor, a feedforward compensating transconductor, a compensating capacitor and a loading capacitor, wherein the main signal transconductor comprises N+1 main signal transconductance units which are in step linkage to form a main signal path, the feedforward compensating conductance comprises N feedforward compensating conductance units which are used for forming a left half-plane zero point and improving the phase margin, the compensating capacitor comprises N capacitors used for improving the stability of a high-conductance amplifier because the Miller effect enables main poles are separated from non-main poles, and the loading capacitor comprises a capacitor forming the pole of a conductance amplifier with a loading resistor. An RNGCC circuit provided by the invention effectively improves the phase margin, has simple structure and is suitable for the necessary low power supply voltage of the future CMOS technology, and the applying prospect is wide.

Description

technical field [0001] The present invention relates to the design field of complementary metal oxide semiconductor transistor (Complementary Metal Oxide Semiconductor, hereinafter referred to as CMOS) integrated transconductance amplifier, especially a reversed network transconductance-capacitance compensation (Reversed Nested Gm-C Compensation, hereinafter referred to as RNGCC) circuit. Background technique [0002] In recent years, with the rapid development of deep submicron integrated circuit technology and consumer electronics equipment industry, the global electronics market has also flourished unprecedentedly. Consumer electronic equipment includes handheld communication and entertainment, wired broadband Internet access, medical equipment, etc., and has quite broad market potential and development prospects. Products with stronger functions and longer working hours will take the lead in the electronic market, so the design of digital and analog circuits with high pe...

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Problems solved by technology

[0006] (2) High gain

[0016] (1) NGCC compensation technology can be popularized and applied in N-level transconductance amplifiers. The design idea is clear and the implementation structure is simple. However, as the number of transconductance amplifier stages increases, the compensation capacitance is directly superimposed on the load capacitance limit due to the Miller effect. The bandwidth of the multistage transconductance amplifier

[0017] (2) The multi-stage transconductance amplifier compensation scheme for loads such as ETC, DFCFC, AFFC, etc., although it effectively expands the bandwidth, it is complicated to implement in practical applications, and it is not easy to extend to N-stage transconductance amplifiers

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