UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Science R W Brodersen Jianhui Zhang Homework 9 Due 12 01 03 EECS 140 Fall 2003 1 In the circuit of Fig 1 ignore all device capacitance Include only CGS1 CGS3 and CO in your calculations Take n 0 01 and all VDSAT 200mV Also take CGS1 CGS2 1pF and CO 100nF Assume M1 3 are active Fig 1 a Determine the poles of the amplifier of Fig 1 if RF i e if RF is removed b If the amplifier of Fig 1 with RF was connected in a unity gain connection i e connect Vin to Vo would the circuit be stable Explain c Determine the poles of the amplifier with RF 10k d Determine the low frequency gain of the amplifier if RF 10k e Estimate the frequency of the lowest pole in a unity gain feedback connection with RF 10k i e connect Vin to Vo 2 Fig 2 In the circuit shown in Fig 2 estimate the settling time for 0 1 error for an input step amplitude Vi 2V into the amplifier below Neglect all capacitors except the three that are explicitly shown VDSAT 200mV all device Assume all devices in saturation amplifier is stable and n p 0 1
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