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HSSC ALM Previous Paper 3 (Held On: 14 March 2020 Shift 3)

Option 1 : sine

HSSC ALM Previous Paper 1 (Held On: 14 March 2020 Shift 1)

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The R-C phase shift oscillator and Wein bridge oscillator are the commonly used circuits for generating a **sinusoidal waveform of required frequency.**

__RC Phase shift oscillator__:

The circuit diagram of the RC phase shift oscillator is shown below:

- The phase shift oscillator is a linear electronic circuit that produces a sine wave output.
- It consists of an inverting amplifier element such as a transistor or op-amp with its output feedback to its input through a phase shift network consisting of resistors and capacitors in a ladder network.
- The feedback network shifts the phase of the amplifier output by 1800 at the oscillation frequency to give positive feedback.

__Wein bridge oscillator__:

The circuit diagram of the Wein bridge oscillator is shown below:

- The Wein bridge oscillator uses two RC networks connected together to
**produce a sinusoidal oscillator.** - The Wein bridge oscillator uses a feedback circuit consisting of a series RC circuit connected with a parallel RC of the same component values producing a phase delay or phase advance depending upon the circuit frequency
- At the resonant frequency, the phase shift is 00.