637E20003C3T

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Oscillators

The 637E20003C3T is an electronic oscillator from Fox Electronics used for frequency stability in general purpose applications. It incorporates a fast retrace crystal oscillator that operates with a wide frequency range from 1.0 MHz to 20 MHz. This oscillator combines a high frequency stability of ± 20 ppm with a reliable performance. It uses a metal hermetically sealed package that is designed for temperature stability and vibration protection.

Application Field

The 637E20003C3T is widely used in telecommunications applications, consumer and scientific instrumentation, frequency synthesisers, and radar equipment. It can also be used for clocks and timing circuits, frequency division and frequency shifting applications.

Working Principle

When the 637E20003C3T is in operation, an external crystal is connected to the internal oscillator circuitry. The frequency stability is then achieved by means of a feedback loop that is used to maintain the frequency of the signal outputted by the oscillator. The output frequency is determined by the external crystal, and it is maintained by the feedback loop.

The feedback loop is composed of the oscillator’s internal circuitry and the external crystal. The internal circuitry contains an amplifier and a phase locked loop (PLL) frequency synthesis integrated circuit. This loop is responsible for capturing the frequency of the external crystal and holding it at the specified frequency.

Once the loop is locked in, it will then generate an output signal that is phase and frequency-locked to the external crystal’s frequency. Any variations in the external crystal’s frequency will be detected by the feedback loop and the oscillator will be adjusted to remain at the specified frequency.

Because the oscillator is tuned to the external crystal, it will maintain excellent frequency stability even in demanding and extreme temperature conditions. This ensures that the 637E20003C3T is a reliable and durable solution for frequency stability.

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