A voltage-controlled oscillator or VCXO Oscillator is an electronic oscillator whose oscillation frequency is regulated by a voltage input. The applied input voltage identifies the instantaneous oscillation frequency. Consequently, modulating signals control input might cause frequency modulation or stage modulation. A VCXO may also be part of a phase-locked loop. To learn more about VCXO Oscillators, visit QVSTech.com. There are 2 reasons for making use of a VCXO Oscillators:
- To adjust the output frequency to match (or perhaps be some precise multiple of) an accurate external reference.
- Where the oscillator drives devices that may produce radio-frequency disturbance, adding a varying voltage to its control input can distribute the interference spectrum to make it less objectionable.
Temperature-Compensated VCXO Oscillators
A temperature-compensated VCXO Oscillators includes elements that partially remedy the dependence on temperature level of the resonant frequency of the crystal. A smaller sized variety of voltage control then suffices to support the oscillator frequency in applications where temperature level differs, such as heat accumulation inside a transmitter.
Placing the oscillator in a temperature-controlled “oven” at a consistent but higher-than-ambient temperature level is another method to support oscillator frequency. High stability crystal oscillator references often position the crystal in an oven and use a voltage input for fine control. The temperature is chosen to be the turnover temperature: the temperature where small changes do not influence the resonance. The control voltage can be used to periodically adjust the reference frequency to a NIST source. Advanced designs of the VCXO Oscillators may also adjust the control voltage with time to compensate for crystal maturing.
A clock generator is an oscillator that supplies a timing signal to synchronize operations in digital circuits. VCXO clock generators are made use of in many locations such as digital TELEVISION, modems, transmitters and computer systems. Design parameters for a VCXO oscillator clock generator are tuning voltage variety, center frequency, frequency tuning range and the timing jitter of the output signal. Jitter is a kind of phase sound that should be decreased in applications such as radio receivers, transmitters and determining equipment.
The tuning range of VCXO Oscillators is generally a few parts per million over a control voltage range of generally 0 to 3 volts. When a broader selection of clock frequencies is required the VCXO output can be gone through digital divider circuits to obtain lower frequency or be fed to a Phase Locked Loop. ICs consisting of both a VCXO Oscillators (for external crystal) and a PLL are readily available. A normal application is to supply clock frequencies in a variety from 12 kHz to 96 kHz to an audio digital to analog converter. Click on the link QVS TECH to speak to a representative.
- To adjust the output frequency to match (or perhaps be some precise multiple of) an accurate external reference.
- Where the oscillator drives devices that may produce radio-frequency disturbance, adding a varying voltage to its control input can distribute the interference spectrum to make it less objectionable.
Temperature-Compensated VCXO Oscillators
A temperature-compensated VCXO Oscillators includes elements that partially remedy the dependence on temperature level of the resonant frequency of the crystal. A smaller sized variety of voltage control then suffices to support the oscillator frequency in applications where temperature level differs, such as heat accumulation inside a transmitter.
Placing the oscillator in a temperature-controlled “oven” at a consistent but higher-than-ambient temperature level is another method to support oscillator frequency. High stability crystal oscillator references often position the crystal in an oven and use a voltage input for fine control. The temperature is chosen to be the turnover temperature: the temperature where small changes do not influence the resonance. The control voltage can be used to periodically adjust the reference frequency to a NIST source. Advanced designs of the VCXO Oscillators may also adjust the control voltage with time to compensate for crystal maturing.
A clock generator is an oscillator that supplies a timing signal to synchronize operations in digital circuits. VCXO clock generators are made use of in many locations such as digital TELEVISION, modems, transmitters and computer systems. Design parameters for a VCXO oscillator clock generator are tuning voltage variety, center frequency, frequency tuning range and the timing jitter of the output signal. Jitter is a kind of phase sound that should be decreased in applications such as radio receivers, transmitters and determining equipment.
The tuning range of VCXO Oscillators is generally a few parts per million over a control voltage range of generally 0 to 3 volts. When a broader selection of clock frequencies is required the VCXO output can be gone through digital divider circuits to obtain lower frequency or be fed to a Phase Locked Loop. ICs consisting of both a VCXO Oscillators (for external crystal) and a PLL are readily available. A normal application is to supply clock frequencies in a variety from 12 kHz to 96 kHz to an audio digital to analog converter. Click on the link QVS TECH to speak to a representative.