EE 140 ANALOG INTEGRATED CIRCUITS SPRING 2011 C Nguyen PROBLEM SET 12 Issued Tuesday April 26h 2011 Due Tuesday May 3rd 2011 5 00 p m in the EE 140 homework box in 240 Cory 1 The ac schematic of a shunt shunt feedback amplifier is shown in Fig PS12 1 ac schematic means that biasing is not shown but that you should assume that all devices are biased appropriately All transistors have ID 1 mA W L 100 k 60 A V2 and 1 50 V a Calculate the overall gain vo ii the loop transmission the input impedance and the output impedance at low frequencies b If the circuit is fed from a source resistance of 1 k in parallel with ii what is the new output resistance of the circuit 10 k vo 5 k M1 5 k M2 5 k M3 ii Fig PS12 1 2 Assume the BiCMOS amplifier of Fig PS12 2 is fed from a current source Calculate the low frequency small signal transresistance vo ii the loop gain and the input and output impedances of the circuit Use the following parameters in your calculation IS 10 16A F 100 rb 0 VA nCox 200 A V2 Vt 0 6V and 0 EE 140 ANALOG INTEGRATED CIRCUITS SPRING 2011 C Nguyen Fig PS12 2 3 A CMOS feedback amplifier is shown in Fig PS12 3 If the dc input voltage is zero calculate the overall voltage gain vo vi and the output resistance Compare your answer with a SPICE simulation Use the following nCox 60 A V2 pCox 30 A V2 Vtn 0 8 V Vtp 0 8 V n p 0 03 V 1 and n p 0 Fig PS12 3
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