Analog Electronics - 7
10 Questions MCQ Test GATE ECE (Electronics) 2023 Mock Test Series | Analog Electronics - 7
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For the Wien-bridge oscillator circuit shown below, the condition for bridge balance is
At oscillator frequency 
i.e. gain of non-inverting amplifier 
⇒ RB = 2RA
Find the value of inductance in (mH) in the oscillator shown below to achieve a frequency of oscillation = 100 KHz is
For the circuit shown in the figure the value of R to get oscillation of 100 kHz is ________ KΩ.
The given oscillator is Colpitts’s oscillator
The condition for oscillation is
|Aβ|=1
A = -R2/R1
β=C2/C1
The figure shows a phase-shift oscillator circuit with voltage follower buffer stages.
The value of R2/R required for sustained oscillations is _____.
[Assume ideal op-amps and neglect loading effect].
- The basic amplifier of the circuit is the op-amp A3.
- The output of amplifier is connected to 3 stage RC filter.
- Voltage followers eliminate loading effect of each stage.
Transfer function of first RC network
RC networks are identical and no loading effect
The amplifier A3 is connected in inverting mode
The loop gain is
Substitute real part of denominator to zero
At this frequency
The value of R in oscillator circuit shown in a given circuit below is chosen such that it oscillates at an angular frequency of ω. The value of ω and the required value of R will respectively be
Hartley oscillator
Amp with +ve F.B
Loop again AB = 1 + j0
At oscillation
∠AB = 0 (no reactance XL = XC)
At frequency of oscillation look lies resistive Network
For ideal op amp
Use voltage division Rule
R + 1 = 21
R = 20 kΩ
R = 2 × 104Ω
The frequency of oscillation of the circuit in kilohertz is ______ kHz.
The given circuit is wein bridge oscillator.
R3 = R4 = 159 KΩ
C1 = C2 = 1 nF
= 103 HZ
= 1 KHZ
For the transistor oscillator circuit given below the frequency of oscillation is 8.5 kHz. The value of the collector resistor approximately is
In a transistor phase shift oscillator the oscillation frequency
R, C are the resistor and the capacitor in phase shift circuit
RC is collector capacitance
⇒ RC = 2R = 10 kΩ
The oscillation frequency if the below-shown oscillator is 1 kHz then the value of ‘L’ is ______ mH
The given oscillator is Hartley oscillator, where the oscillation frequency.
= 253.3 mH
Leq = L + 5 mA
⇒ L = 253.3 – 5
= 248. 3 mH
For the circuit shown the value of R1 and R2 such that the circuit generates oscillations of frequency 274 Hz is [Assume the time constant of the feedback RC network is 0.01 sec]
Given figure is of A-stable multi-vibrator,
Time constant is given by
β = feedback factor
τ = time constant of feedback loop:
Option 3 satisfies the condition
The frequency of oscillation of the circuit shown below is ________ Hz.
The given oscillator is Wien-bridge oscillator with R = 5 kΩ, C = 1 μF
⇒ frequency of oscillation f = 1/2πRC
= 31.8 Hz
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