The circuit shown is a MOS cascade amplifier. Calculate the input resistance of transistor Q2?
+VDD
Question 2
For the DC analysis of the common base amplifier shown, consider under these conditions, the value of mid band voltage gain is ______
Question 3
Consider the class emitter follower circuit as shown in figure. All transistors are matched with parameters (VBE)ON = 0.7V , (VCE)Sat = 0.2V and VA = ∞. Neglecting base current |Vomax| + |Vomin| is equal to ____ V
[Q2 & Q3 should always be in linear mode].
Question 4
Match list 1(Type of amplifier) with list II (Property) and select the correct answer using the code given below the lists:
List - I
A) Single ended class A
B) Class AB push pull
C) Class B push pull
D) Class C
List - II
1) Medium efficiency with minimum distortion
2) High efficiency with crossover distortion
3) Harmonic generator with highest possible conversion efficiency
4) Poor conversion efficiency with minimum distortion
Question 5
Find the frequency of oscillation of a Colpitts oscillator with C1 = 0.004 μF, C2 = 0.03 μF, and L = 4.0 mH.
Question 6
In the circuit shown in figure, the output voltage V o is _______ V
Question 7
Consider the waveform shown below:
If the input is a 100V peak square wave with a period of 20 ms. The output is so designed that it has a maximum value of 25 and minimum of –175V at the steady state, then the circuit which can perform this function can be represented as
Question 8
Given astable multivibrator generate square wave of 10 kHz with 60% duty cycle. It uses a capacitor of 500 pF. Find the value of R1 & R2.
Question 9
Consider the Schmitt trigger circuit shown below the Hysteresis width in Volts is……?
Question 10
The NMOS and PMOS transistor are matched with = 1V, Assume λ = 0 for both devices.
Calculate the output voltage Vo (in Volt) for Vin = 2.5 V
Question 11
A sinusoidal signal VS = 1.95 sin 400t is applied to a power amplifier. The resulting current is Io = 12 sin 400t + 1.2 sin 800t + 0.9 sin 1200t + 0.4 sin 1600t. Find the increase in power because of distortion.
Question 12
For the transistor shown below β = 150.
If IQ = 2mA, the value of Vo (in V)is
Question 13
In the given figure, cut in voltage of both zener diode Dz and D is 0.7V, while breakdown voltage of zener is 3.3V and reverse break down of D is 50V. The other parameters can be assumed to be the same as those of an ideal diode. The values of the peak output voltage (V0) are (given ω= 314 rad/sec)
Question 14
Consider the circuit shown below
The type of amplifier and feedback factor of the amplifier
Question 15
A depletion NMOS transistor circuit has following parameters
Vth = – 2V, kn = 5m A/v2 , λ = 0.01v–1 Find the voltage gain, Av