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# hw8 - R L 1 kΩ Output linear swing ≥ 1 V 0-to-peak...

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ELEN 325 HOMEWORK #8 ( Due date: Monday December 4, 2006) 1. For the circuits below, k 0 n = 100 μA/V 2 , k 0 p = 50 μA/V 2 , V tn = | V tp | = 1 V . Find the small-signal gain ( v o /v i ) for λ n = | λ p | = 0 and λ n = | λ p | = 0 . 05 V - 1 . (a) (b) 5/1 V i V o +5 20k 30k 24k 40k +4 V o V i 30k 20/1 15k 20k 30k 1k 2. In the circuit below, V G is a DC bias voltage, k 0 n = 100 μA/V 2 , k 0 p = 50 μA/V 2 , V tn = | V tp | = 1 V , λ n = | λ p | = 0 . 05 V - 1 . Assume that all transistors are in the active region. Find the small-signal gain ( v o /v i ). 50/1 10/1 30/1 M 1 M 2 M 3 M 4 M 5 M 6 M 7 M 8 M 9 M 10 V G V i M 12 M 11 15/1 5/1 V o 3k -5 +5 30/1 40/1 10/1 25/1 25/1 40/1 30/1 3. In the following circuit, V i ( t ) = 2 + 0 . 01 sin(10 7 t ), k 0 n = 80 μA/V 2 , k 0 p = 40 μA/V 2 , V tn = | V tp | = 0 . 5 V , λ n = | λ p | = 0 . 05 V - 1 . (a) Find the small-signal transfer function v o ( s ) /v i ( s ) and sketch its magnitude Bode plot. (b) Find the total output voltage V o ( t ). 5/1 10/1 M 1 M 2 M 3 M 4 10/1 M 7 M 5 5/1 M 6 V i V o 45/1 5/1 100nF 3V 40/1 10pF 4. Design a MOSFET ampliﬁer with the following speciﬁcations. Single supply 5 V Total supply current 2 mA Gain ( | v o /v i | ) 25 Input resistance ( R i ) 100 kΩ Load resistance (
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Unformatted text preview: R L ) 1 kΩ Output linear swing ≥ 1 V 0-to-peak Input & Output DC levels 0 V V ov for any transistor ≥ 0.2 V V tn = | V tp | = 1 V k n = 100 μA/V 2 k p = 50 μA/V 2 λ n = | λ p | = 0 W min = 3 u W max = 600 u L = 1 u The ampliﬁer circuit should not include any ideal voltage or current source (it should be composed of transistors, resistors and capacitors). The only DC source in your ﬁnal schematic should be the 5-V supply voltage. Show your design procedure and calculations. Simulate the ampliﬁer using PSPICE (use NMOS and PMOS models) and verify that all speciﬁcations are satisﬁed. Provide all necessary plots and show your measurements....
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