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 VCC 10V VBE 0 6V VCES 0 2V F 100 RC 10k RE 1 4k RF 100k RG 1k CB 10 F VCC RC Q2 CB Q1 vOUT RG vIN RF RE 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 nCox 30 A V2 Vtn 0 8V Vtp 0 8V n p 0 and n 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 nCox 60 10 6 A V2 pCox 30 10 6 A V2 Vtn 0 8 V Vtp 0 8 V n p 0 03 V 1 and n p 0 Figure PS11 3
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