UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Science R.W. Brodersen Homework #9 EECS 140 Jianhui Zhang (Due 12/01/03) Fall 2003 1. In the circuit of Fig.1, ignore all device capacitance. Include only CGS1, CGS3, and CO in your calculations. Take λn = 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 = 10kΩ. d. Determine the low frequency gain of the amplifier if RF = 10kΩ. e. Estimate the frequency of the lowest pole in a unity gain feedback connection with RF = 10kΩ, 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 λn = λp =
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