Question

Please include steps, an explanation of all parts and formulas used. Thank you.

High Frequencey Response of the CG and Cascode Amplifiers Exercise 10.21: In this exercise, we wish to contrast the gain and bandwidth of CS and cascode amplifiers Assume that both are fed with large source resistance Rsig that effectively determines the high-frequency response. Thus, neglect components of τΗ that do not include Rsig . Also assume that all transistors operated at the same condition and thus corresponding small signal parameters are equal. Also, both transistors have equal RLTo and gmTo 40. a) Find the ratio of the low-frequency gain of the cascode amplifier to that of the CS. b) For the case of Cgd 0.25 Cgs, find the ratio of the cascode to that of the CS amplifier. c) Use (a) and (b) to find the ratio of ft of the cascode to that of the CS.

Answer 1

ElO.2 Acascade-2 2% 280 =80 6.25 73 3-6