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Voltage Controlled Crystal Oscillators (VCXO)

Voltage Controlled Crystal Oscillators add electrical trimming to a crystal reference. They are used when clock recovery, reference correction or PLL cleanup needs small frequency control with crystal-based stability.

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VCXO crystal oscillator for controlled reference trimming

FAQ

How should frequency accuracy, temperature stability, aging and holdover be specified?

Specify accuracy, temperature, aging and holdover as separate error terms with their own interval, environment, warm-up and reference history instead of one unexplained ppm value.

Engineering inquiry

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Voltage Controlled Crystal Oscillators (VCXO)

A VCXO keeps the stability of a crystal oscillator while allowing a limited frequency pull through a control voltage. Its role is fine correction, not wideband RF tuning.

System role

VCXOs are used in clock recovery, reference cleanup, synchronization loops, PLL reference paths, telecom timing and instruments that need controlled correction around a nominal frequency.

Data to confirm

Typical records include nominal frequency, pull range, frequency stability, phase noise, jitter, control voltage range, output logic format, supply current and operating temperature.