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Crystal and frequency control glossary

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VCO

Voltage-controlled oscillator. Applications may include FSK generation, voltage and current-to-frequency conversion, stable phase-locked loop, waveform generation – triangle, sawtooth, pulse, squarewave, FM and sweep generation.

VCTCXO

A voltage controlled temperature compensated crystal oscillator. VCTCXOs have a wide range of applications in wireless telecommunications such as portable telephone, VHF/UHF, CATV, instrument for GPS, PLL circuits, AFC circuits, and Radio Frequency (RF) modules.

VCXO

A crystal controlled oscillator where the frequency changes in direct proportion to the application of a control voltage. Often used in phase lock loop (PLL) circuits in telecom timing recovery, wireless base station channel or timing reference, and fiber optic timing reference.

Very-high frequency (VHF)

The part of the radio spectrum from 30 to 300 MHz that includes TV channels 2-13, the FM broadcast band, and some marine, aviation and land mobile services.

Very small aperture terminal (VSAT)

Very small aperture terminal (satellite service) is satellite communications system that serves home and business users. A VSAT end user needs a box that interfaces between the user's computer and an outside antenna with a transceiver.

Vestigial side band (VSB)

Modified AM transmission in which one sideband, the carrier, and only a portion of the other sideband are transmitted.

VOFDM

Abbreviation for vector orthogonal frequency division multiplexing.

Volt

The basic practical unit of difference of (electrical) potential.

Voltage

Also called electromotive force. Voltage is a quantitative expression of the potential difference in charge between two points in an electrical field. The greater the voltage, the greater the flow of electrical current (that is, the quantity of charge carriers that pass a fixed point per unit of time) through a conducting or semiconducting medium for a given resistance to the flow. Voltage is symbolized by an uppercase italic letter V or E.

Voltage standing wave ratio (VSWR)

In a transmission line, the ratio of maximum to minimum voltage in a standing wave pattern.

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