Oscillator Output Gain and Phase Shift
At high frequencies circuit behaves like lag circuit and the reactance of the parallel capacitor, (C2) turns out to be exceptionally low, so this capacitor acts like a short circuit across the output, so there is no output signal.
At low frequencies circuit behaves like lead circuit and the reactance of the series capacitor (C1) becomes exceptionally high , it act as an open circuit, blocking the input signal produces no output signal.
The frequency of the input waveform at which output voltage reaches its maximum value (in between C1 being open-circuited and C2 being short-circuited ) is called the Resonant Frequency.
At resonant frequency, the circuit’s reactance( XC) equals to its resistance( Xc = R), and the phase difference between the input and output equals zero degrees (0°).
The magnitude of the output voltage at its maximum is equal 3 or more times of the input voltage which is taken as Voltage gain (AV ).
[Tex] V_{out } \geq 3 V_{in}[/Tex]
[Tex]\frac{V_{out}}{V_{in}}\geq 3[/Tex]
[Tex]A_{v}\geq 3[/Tex]
Wien Bridge Oscillator Frequency
The Wien Bridge Oscillator frequency at resonance is,
[Tex]f_{r}=\frac{1}{2\pi RC}[/Tex]
Where fr = Resonant Frequency in Hertz
C = Capacitance in Farads
R = Resistance in Ohms
The total phase shift of the Wien Bridge oscillator circuit is 0° at resonance(Circuit is balanced). The frequency of oscillation is equal to the resonant frequency of the circuit.
Wien Bridge Oscillator
In this article, we will go through the Wien Bridge Oscillator, first, we will start our article with the introduction of the bridge oscillator frequency, then we will go through the RC phase shift network and oscillator output gain and phase shift, then we will see Wien bridge oscillator frequency, then we will go through RC network and construction of bridge oscillator frequency using IC 741 operational amplifier, at last, we will conclude our article with solved examples, advantages, disadvantages and some FAQs.
Table of Content
- Wien Bridge Oscillator
- RC Phase shift Network
- Oscillator Output Gain and Phase Shift
- The RC Network
- Construction
- Solved Examples
- Advantages of Wien Bridge Oscillator
- Disadvantages of Wien Bridge Oscillator
- Applications of Wien Bridge Oscillator