VCXO: A Crystal Oscillator With Variable Frequency


A VCXO is a crystal oscillator that includes a varactor diode and associated circuitry, which allows the frequency to be changed by applying a voltage across that diode. This can be accomplished in a simple clock or sinewave crystal oscillator. Adding the diode to a Temperature-Compensated Crystal Oscillator (TCXO) will create a TC/VCXO. Adding the diode to an Oven-Controlled Crystal Oscillator (OCXO) will create an OC/VCXO.

Low-Jitter, Wide-Temperature and Ruggedized VCXOs


VX-706 VCXO

VX-706

Low Noise

This discrete VCXO is offered in a 5 × 7 mm footprint with improved phase noise and jitter performance previously only available in the VX-501, which comes in a 9 × 14 mm package.

VX-504 VCXO

VX-504

Harsh Environment

This low g-sensitivity VCXO features 0.3 ppb/g with jitter performance of 60 fsec over the offset bandwidth of 12 kHz to 20 MHz. It supports frequencies up to 160 MHz and is excellent for industrial and harsh environment applications.

VX-505 VCXO

VX-505

Low Phase Noise

The VX-505 VCXO provides a phase noise floor as low as −166 dBc/Hz across the extended temperature range of −55°C to 125°C. It supports frequencies ranging from 20 MHz to 800 MHz.

OX-204 VCXO

VX-506

Low Phase Noise

The VX-506 is a discrete VCXO in a 9 × 14 mm footprint with ultra-low phase noise and jitter performances. 

VCXO Parametric Chart


VCXO Application Notes and Additional Information


Additional Oscillator Products Acquired from Vectron®


With the acquisition of Vectron, we offer a more comprehensive portfolio of oscillator technologies, services and solutions so you can build more reliable systems supporting today’s precise timing standards. These solutions include OCXOs, TCXOs, VCXOs, VCSOs, GNSS-DOs, high-reliability crystals and high-reliability space and defense products.

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