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tells about Op-amps,differential amplifiers
Typology: Exercises
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Microelectronic Circuits Tutorial 7
Ex 1: In the circuit of figure below, (W /L) 1 , 2 = 50 / 0. 5 and ISS = 0. 5 mA
(a) What is the maximum allowable output voltage swing if Vin,CM = 1. 2 V? (b) What is the voltage gain under this condition?
Ex 2: A differential pair uses input NMOS devices with W /L = 50 / 0. 5 and 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 Vin 1 −Vin 2 = 50 mV? (c) What is the equivalent Gm under this condition? (d) For what value of Vin 1 −Vin 2 does the Gm drop by 10%? By 90%?
Ex 3: In the MOS differential pair of figure below, VCM = 1 V , ISS = 1 mA, and RD = 1 kΩ. What is the minimum allowable supply voltage if the transistors must remain in saturation? Assume VT H,n = 0. 5 V. μnCox=200 μA/V 2 , μpCox=100 μA/V 2 , λ = 0 ,
Microelectronic Circuits (EEE F244/ECE F244/INSTR F244) Page 2 of 3 Ex 4: The MOS differential pair of figure below must be designed for an equilibrium over-drive of 200 mV. If μnCox=100 μA/V 2 and W /L = 20 / 0. 18 , what is the required value of ISS?
Ex 5: Calculate the differential voltage gain of the circuits depicted in figure below. Assume perfect symmetry and λ > 0.
Ex 6: Calculate the differential voltage gain of the circuits depicted in figure below. Assume perfect symmetry and λ > 0. You may need to compute the gain as Av = −GmRout in some cases.