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设计了一种高性能BiCMOS全差分运算放大器。该运放采用复用型折叠式共源共栅结构、开关电容共模反馈以及增益增强技术,在相同功耗和负载电容条件下,与传统CMOS增益增强型运算放大器相比,具有高单位增益带宽、高摆率及相位裕度改善的特点。在Cadence环境下,基于Jazz 0.35μm BiCMOS标准工艺模型,对电路进行Spectre仿真。在5 V电源电压下,驱动6 pF负载时,获得开环增益为115.3 dB、单位增益带宽为161.7 MHz、开环相位裕度为77.3°、摆率为327.0 V/μm、直流功耗(电流)为1.5 mA。
A high performance BiCMOS fully differential op amp is designed. The op amp uses a reusable folded cascode structure, switched-mode common-mode feedback, and gain-boosting techniques to achieve high unity gain over conventional CMOS gain-boosted op amps for the same power and load capacitance Bandwidth, high slew rate and phase margin improvement. In the Cadence environment, Specter simulation of the circuit was based on the Jazz 0.35μm BiCMOS standard process model. Open loop gain of 115.3 dB at a 6 pF load with a supply voltage of 5 V, a unity gain bandwidth of 161.7 MHz, an open-loop phase margin of 77.3 ° and slew rate of 327.0 V / μm, DC power dissipation (current ) Is 1.5 mA.