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In WeinтАЩs bridge, the output frequency is determined by
RLC combination
LC combination
RC combination
RL combination
RC combination
Quick Summary: The Wien's bridge oscillator is a frequency-selective bridge network that uses an RC series-parallel combination to determine the frequency of oscillation. The bridge achieves zero phase shift at a specific resonant frequency, which is determined solely by the values of the resistors and capacitors in the lead-lag network.
The Wien's bridge oscillator is a frequency-selective bridge network that uses an RC series-parallel combination to determine the frequency of oscillation. The bridge achieves zero phase shift at a specific resonant frequency, which is determined solely by the values of the resistors and capacitors in the lead-lag network.
f0тАЛ=2╧АRC1тАЛ тАФ Resonant frequency of the Wien bridge
╬▓=31тАЛ тАФ Feedback factor at resonance
The frequency-selective feedback network consists of a series RC circuit and a parallel RC circuit connected in series. At the resonant frequency, the voltage across the parallel combination is exactly in phase with the input voltage, satisfying the Barkhausen criterion for oscillation. The bridge balance condition leads to the frequency expression where the reactive components cancel out.
The Wien bridge is widely used in audio frequency oscillators.
It requires a minimum gain of 3 (AvтАЛ тЙе 3) from the amplifier stage to sustain oscillations.
The bridge utilizes a lead-lag network to produce zero phase shift.
Unlike LC circuits, RC networks are more suitable for lower frequencies.
Excellent frequency stability
Easy to tune over a wide frequency range
Produces a low-distortion sine wave
Requires a high-gain amplifier for oscillation
Frequency range limited by the values of R and C
Cannot generate very high (radio) frequencies effectively
Audio frequency signal generators
Distortion testing of audio equipment
Function generators
In the Wien bridge, the four arms consist of: one pure resistor, one pure capacitor, one series RC circuit, and one parallel RC circuit.
Option B (LC combination) is used in Hartley or Colpitts oscillators for high radio frequencies, not the Wien bridge.
C is correct тАФ The output frequency of a Wien bridge is determined by the RC combination forming the lead-lag feedback network.
Always remember that LC oscillators are for high-frequency (Radio) applications, while RC oscillators like Wien bridge and Phase-shift oscillators are for low-frequency (Audio) applications.