# What is VCXO oscillator?

## What is VCXO oscillator?

Abstract: A VCXO (voltage controlled crystal oscillator) is an oscillator whose frequency is determined by a crystal, but can be adjusted by a small amount by changing a control voltage. VCXO clock (CLK) generators have been used in various applications, such as digital TV, digital audio, ADSL, and STB.

## What is TCXO and OCXO?

The oscillation frequency of a crystal changes as temperature varies. Both TCXOs (Temperature Compensated Crystal Oscillators) and OCXOs (Oven Controlled Crystal Oscillators) are crystal oscillators whose oscillation frequency does not vary as much at high temperatures or when the temperature fluctuates.

What does OCXO mean?

Oven Controlled Crystal (Xtal)
The term OCXO is an acronym for Oven Controlled Crystal (Xtal) Oscillator.

What is TCXO used for?

A TCXO is a temperature-compensated crystal oscillator that is used whenever particularly high stability within a variant temperature environment is required, i.e. when the frequency deviation of the oscillator must be minimal over its entire operating temperature range.

### Which oscillator is more stable?

crystal oscillator
A crystal oscillator is the most stable frequency oscillator.

### Why is crystal oscillator used?

Crystal oscillators are used mainly in digital integrated circuits for providing a stable clock signal and in specific applications which require high-frequency reference.

What is ppm in crystal oscillators?

Parts per Million (ppm): 1 ppm means 1/106 part of a nominal frequency. For example – If a quartz oscillator has an output frequency of 1 MHz (1000000 Hz) and it has a Frequency Stability of 5 ppm, it will vary in frequency by 5 Hz.

What is the function of VCO?

A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency is proportional to its input voltage. An oscillator produces a periodic AC signal, and in VCOs, the oscillation frequency is determined by voltage.

#### Which oscillator is more stable and why?

A crystal oscillator is the most stable frequency oscillator. Advantages: The crystal oscillator is possible to obtain a very high precise and stable frequency of oscillators. It has very-low-frequency drift due to change in temperature and other parameters.