清华大学微电子所讲义.pdfVIP

清华大学微电子学研究所 Nov. 5, 2004 运算放大器（一） 池保勇 010O) 清华大学微电子学研究所设计室 教材：P.R. Gray, “Analysis and Design of Analog Integrated Circuits”, §4.3.5, §6.2～§6.3 作业：习题一、习题二、习题三* （选做） 习题一 习题二 For the p-channel input, CMOS op amp of the following figure, calculate the open-loop, low-frequency differential gain, the output resistance, the power consumption, the power-supply rejection ratio at dc, the input common-mode range, the output voltage swing, the slew rate, the common-mode rejection ratio, and the unity gain bandwidth for a load capacitance of 20pF. Design the W/L ratios of M9 and M10 to give a resistance of 1/gm6. k 110µA / V2 n k 50µA / V2 p V −V 0.7V tn tp λ λ 0.04V−1 n p 1/ 2 γ 0.4V 2φ 0.7V f 习题三* The CMOS op amp shown in the following figure was designed, fabricated, and tested. It worked satisfactorily except that when the op amp was in a unity-gain configuration, the positive peak of a +/-1.5V sinusoid oscillated as illustrated. What caused this oscillation and how can it be fixed? 2 2 k 8µA / V k 28µA / V p n V −V 0.7V λ λ 0.01V−1 tn tp n p 1/ 2 1/ 2 γ 0.35V γ 0.9V n p 2φ 0.5V f 提要 电流镜作负载的差分对 运放的输入级 运算放大器的性能参数