set11new - ECE3050 Assignment 11 1. The f gure shows the ac...

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Unformatted text preview: ECE3050 Assignment 11 1. The f gure shows the ac signal circuit of a cascade common-source ampli f er. For each MOS- FET, it is given that I D = 2mA , r = , and K = 0 . 25 10 3 A / V 2 . The circuit element values are R S = 1k , R S 1 = R S 2 = 510 , R D 1 = R D 2 = 15k . (a) Show that g m 1 = g m 2 = 1 . 414mS and r s 1 = r s 2 = 707 . 1 . (b) Use the T models or simpli f ed T models to show that the voltage gain is given by v o v s = R D 1 r s 1 + R S 1 R D 2 r s 2 + R S 2 = 152 (43 . 6dB) (c) Use the models to show that the voltage gain is given by v o v s = R D 1 1 g m 1 + R S 1 R D 2 1 g m 2 + R S 2 = 152 (43 . 6dB) (d) Show that the input resistance is given by r in = (e) Show that the output resistance is given by r out = R D 2 = 15k (f) What would be the new gain if a resistor R L = 1k is connected from output to ground?...
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set11new - ECE3050 Assignment 11 1. The f gure shows the ac...

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