This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: ECE3050 Assignment 11 1. The f gure shows the ac signal circuit of a cascade commonsource 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?...
View Full
Document
 Summer '08
 HOLLIS

Click to edit the document details