Consider the following statements about an oscillator and choose which of them are true. An oscillatora)has noise as the initial signalb)consists of a noise injecting networkc)consists of a frequency selecting networkd)consists of a positive feedback amplifierCorrect answer is option 'A,C,D'. Can you explain this answer?

Question

Answer

An oscillator is a system consisting of active and passive circuit elements to produce a sinusoidal or other respective waveforms at the output without the amplification of an external source (signal). It transforms the dc power from the source to the ac power in the load.
This consists of a positive feedback amplifier and has noise as the initial signal and consists of a frequency signal selector.
The correct answers are: consists of a positive feedback amplifier, has noise as the initial signal, consists of a frequency selecting network

Answer

Overview:
An oscillator is an electronic circuit that generates a periodic waveform, typically a sinusoidal waveform, with a constant frequency. It is an essential component in many electronic devices, including radios, televisions, and computers. In order to understand which statements about an oscillator are true, let's analyze each option in detail.

Analysis:
a) Has noise as the initial signal:
This statement is true. In an oscillator, noise can act as the initial signal that triggers the oscillation. Noise refers to random fluctuations in voltage or current that can be present in any electronic circuit. In an oscillator, this noise can initiate the oscillation process, which then generates a stable periodic waveform.

b) Consists of a noise injecting network:
This statement is false. An oscillator does not typically consist of a noise injecting network. Instead, it relies on the inherent noise present in the electronic components and the circuit itself to initiate the oscillation.

c) Consists of a frequency selecting network:
This statement is true. An oscillator consists of a frequency selecting network, which determines the desired frequency of the output waveform. This network can include components such as capacitors, inductors, and resistors that create a resonant circuit with a specific frequency.

d) Consists of a positive feedback amplifier:
This statement is true. An oscillator consists of a positive feedback amplifier. The positive feedback loop in the amplifier provides the necessary gain to sustain the oscillation. It amplifies the output signal and feeds it back to the input, reinforcing the oscillation.

Conclusion:
In conclusion, the true statements about an oscillator are:
- It has noise as the initial signal.
- It consists of a frequency selecting network.
- It consists of a positive feedback amplifier.

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