EE 140 ANALOG INTEGRATED CIRCUITS SPRING 2009 C. Nguyen PROBLEM SET #11 Issued: Tuesday, April 28, 2009 Due: Wednesday, May 6, 2009, 5:00 p.m. in the EE 140 homework box in 240 Cory 1. For the feedback amplifier in Figure PS11-1 calculate: (a) The output voltage at the quiescent point. (b) Midband loop gain. (c) Midband closed loop gain. (d) Midband input impedance. (e) Midband output impedance. FCkRkRkRkRVVVVVVBGFECFCESBECCμβ10,1,100,4.1,10,100,2.0,6.0,10=Ω=Ω=Ω=Ω===== RERFRCCBvINQ1Q2RGVCCvOUT Figure PS11-1 2. A variable-gain CMOS amplifier is shown in Fig. PS11-2. Note that M4 represents shunt feedback around M6. Assuming that the bias value of Vi is adjusted so that VGD6 = 0V dc, calculate bias currents in all devices and the small-signal voltage gain and output resistance for Vc equal to 3V, and then 4V. Compare your answer with a SPICE simulation and use SPICE to plot out the complete large-signal transfer characteristic of the circuit. Use μnCox = 30 μA/V2, Vtn = 0.8V, Vtp = -0.8V, λn = λp = 0, and γn = 0.5V1/2.EE 140 ANALOG INTEGRATED CIRCUITS SPRING 2009 C. Nguyen Figure PS11-2 3. A CMOS feedback amplifier is shown in Fig. PS11-3. If the dc input voltage is zero, calculate the overall gain vo/vi and the output resistance. Compare your answer with a SPICE simulation. Use μnCox = 60 × 10-6 A/V2, μpCox = 30 × 10-6 A/V2, Vtn, = 0.8 V, Vtp = -0.8 V, λn=|λp|=0.03 V-1, and γn=. γp=0. Figure
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