折叠式级联运放的仿真_运放基本仿真步骤PPT课件.pptVIP

ADE of OSR To add a model for the simulation From ADE-Setup-Model libraries To create a DC Sweep From ADE-Analyses-Choose-DC Waveform of OSR You can get the left waveform from page 8. OSR The output swing range is from 842.5mV to 4.381V. PS: OSR is dependence of applications and is not constant. Input Capacitor Where, VCM_IN is the input common voltage, VAC is AC voltage for AC Sweep. Test-Bench of CIN VCM_IN VAC ADE of CIN To add a model for the simulation From ADE-Setup-Model libraries To create a AC Sweep From ADE-Analyses-Choose-AC Waveform of CIN The input capacitor is approximate of 5pf Output Resistance The schematic of obtaining open-loop output resistance RO. The equivalent model by using Thevenin form On the op amp. Thus, simulating ROUT and knowing AV allows one to calculate the output resistance RO of the op amp. Test-Bench of ROUT IOUT VOUT 200R R=1G VIN=0V ADE of ROUT To add a model for the simulation From ADE-Setup-Model libraries To create a TRAN Sweep From ADE-Analyses-Choose-TRAN Waveform of ROUT IOUT ROUT Slew Rate The unity-gain configuration places the severest requirements on stability and slew rate because its feedback is the largest, resulting in the largest values of loop-gain, and should always be used as a worst-case measurement. Test-bench of Slew Rate The input step magnitude is 2V. ADE of SR To add a model for the simulation From ADE-Setup-Model libraries To create a Tran From ADE-Analyses-Choose-Tran Waveform of SR SR=95.1K V/s Noise Thermal Noise (A) channel noise (id) (A) RS noise (rs) (A) RD noise (rd) Flicker Noise (fn) Test-Bench of Noise VCM_IN VAC The dominant pole is controlled by CL in folded Cascode op amp. ADE of Noise To add a model for the simulation From ADE-Setup-Model libraries To create a Noise From ADE-Analyses-Choose-noise Waveform of Noise Output noise Input-referred noise To obtain output noise and input-referred noise: From ADE-results-Direct plot