Assignment-1
EE204 - Analog Circuits
Submission Protocol: Drop notebook in hardcopy and code and plots in Moodel
Comment: Partial
1. (a) Find out the peak transconductance (gm) for the MOSFET (TSMC Spice Model shared with you) at VDS = 5 V. (Use SPICE)
(b) What is the corresponding VGS for the same? (Using SPICE)
(c) Find out the intrinsic output resistance (r0) for the same MOSFET for VGS found in (b). (Use SPICE) (d) Draw the small signal equivalent circuit for the MOSFET when VDS = 3 V and VGS found above. (e) Analytically design a regular class-A amplifier (without blocking and de-coupling capacitor) using the small signal equivalent circuit derived in (c) for an open circuit voltage gain of Av = 2. Find out all the parameters for the circuit e.g. VDD, VGG, RD. Find out the output impedance of the amplifier w/ and w/o RD.
(f) Re-design the same circuit in (d) using a single source VDD = 5 V and using R1-R2 potential divider network. Assuming the input blocking capacitance in infinite (CB = ∞).
(g) Find out the gain for the amplifier at 1 MHz and 1mHz in (e) if an additional load resistance RL = 10 kΩ is connected at the output with a decoupling capacitor of 1 μF.
2. Assume k’ = 2 mA/V2, VDD = 15 V and λ = 0.01 V-1.
(a) Design a CS amplifier along with biasing circuit for gain -10 with minimum allowed output impedance. You can choose an appropriate biasing circuit based on your requirement.
(b) Design a CD amplifier along with biasing circuit such that the gain is 0.9 and minimum allowed output impedance. You can choose an appropriate biasing circuit based on your requirement.
(c) Design a CG amplifier with current gain 0.8 with maximum output impedance. You can choose an appropriate biasing circuit based on your requirement.
Simulate the circuits in (a), (b) and (c) and validate your results.
(d) Cascade the CS and CD amplifier you designed earlier with appropriate coupling capacitor. Find out the overall gain and output impedance of your amplifier.
