BIRLA INSTITUTE OF TECHNOLOGY & SCIENCE, PILANI - K. K. BIRLA GOA CAMPUS
Microelectronic Circuits Tutorial 7
Ex 1: In the circuit of figure below, (W/L)1,2=50/0.5and ISS =0.5mA
(a) What is the maximum allowable output voltage swing if Vin,CM =1.2V?
(b) What is the voltage gain under this condition?
Ex 2: A differential pair uses input NMOS devices with W/L=50/0.5and a tail current of 1 mA.
(a) What is the equilibrium overdrive voltage of each transistor?
(b) How is the tail current shared between the two sides if Vin1−Vin2=50mV ?
(c) What is the equivalent Gmunder this condition?
(d) For what value of Vin1−Vin2does the Gmdrop by 10%? By 90%?
Ex 3: In the MOS differential pair of figure below, VCM =1V,ISS =1mA, and RD=1kΩ. What
is the minimum allowable supply voltage if the transistors must remain in saturation? Assume
VTH ,n=0.5V.
µnCox=200 µA/V2,µpCox=100 µA/V2,λ=0,
