What is typically used in FM transmitter and receiver circuits to ensure oscillator stability?

Automatic frequency control (AFC) plays a crucial role in maintaining oscillator stability in FM transmitter and receiver circuits. This system continuously monitors the output frequency of the oscillator and makes adjustments to correct any drift or deviation from the desired frequency. By doing so, AFC ensures that the transmitted signal remains coherent and accurately received, which is essential for effective communication.

The primary function of AFC is to stabilize the frequency of the oscillator in real-time, allowing it to compensate for temperature changes, component aging, and other factors that can introduce frequency instability. This results in clearer reception, reduces distortion, and improves overall signal quality, which are key aspects in frequency modulation audio and video transmissions.

Other methods might contribute to frequency stability, but AFC is specifically designed for real-time correction and adjustment in circuits relying on FM modulation, making it the ideal choice for this context.