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基于Chartered 0.35μm工艺,设计了一种带共模反馈电路的套筒式全差分运算放大器。该电路主要由套筒式结构的主运放、偏置电路和共模反馈电路组成。仿真结果表明,设计的电路开环增益为79.4 dB,单位增益带宽为179 MHz,相位裕度为75.5°(负载Cload=3 pF),功耗为2.31 mW。提出了一种全新的全差分运放增益测试方法,可以比较准确地测得运放的低频增益。对通过流片的电路进行测试和分析,结果与仿真指标基本接近,达到预先设计的要求。
Based on the Chartered 0.35μm process, a sleeve-type fully differential operational amplifier with a common-mode feedback circuit is designed. The circuit is mainly composed of a sleeve-type main op amp, bias circuit and common mode feedback circuit. The simulation results show that the designed circuit has an open loop gain of 79.4 dB, a unity gain bandwidth of 179 MHz and a phase margin of 75.5 ° (load Cload = 3 pF) with a power dissipation of 2.31 mW. A new fully differential operational amplifier gain test method is proposed, which can accurately measure the low frequency gain of the operational amplifier. The test and analysis of the circuit through the chip, the results and simulation indicators are basically close to meet the pre-design requirements.