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设计了一种用于高精度A/D转换器的低功耗跨导运算放大器(OTA)电路。采用全差分两级运放结构、推挽式输出及开关电容共模反馈电路。设计基于SIMC 0.18μm CMOS混合信号工艺,工作电压为1.8V。用Cadence/Spectre仿真器进行仿真,结果表明,负载为2pF时,OTA直流开环增益为63.4dB,单位增益带宽206MHz,相位裕度67°,压摆率75V/μs,功耗650μW。适用于高精度A/D转换器及其他便携式多媒体设备的低压低功耗应用。
A low power transconductance operational amplifier (OTA) circuit is designed for high precision A / D converters. The use of fully differential two op amp structure, push-pull output and switched capacitor common mode feedback circuit. The design is based on a SIMC 0.18μm CMOS mixed-signal process with a 1.8V operating voltage. Simulation results using Cadence / Specter simulator show that the OTA DC open-loop gain is 63.4dB, the unit gain bandwidth is 206MHz, the phase margin is 67 °, the slew rate is 75V / μs and the power dissipation is 650μW when the load is 2pF. Low-voltage, low-power applications for high-precision A / D converters and other portable multimedia devices.