VCXO noun explanation and principle application
VCXO noun explanation and principle application
VCXO (voltage controlled crystal oscillator) is a voltage controlled crystal oscillator that uses different voltages as control sources to adjust the frequency of the quartz resonator by tuning the voltage to change the capacitance of the capacitor diode. The oscillation frequency is determined by the crystal and can be adjusted within a small range by controlling the voltage. VCXO allows a wide frequency control range, with a tuning range of about ± 200ppm or even larger. Commonly used voltages include 1.8V, 2.5V, 3.3V, 5V, etc., with 3.3V being the most widely used.
The VCXO product has voltage control function and is used for data signal acquisition, jitter attenuation, or frequency synthesis in the output frequency internal circuit. The current loss does not exceed 2mA. It has fast start, low voltage operation, low-level driving, and low current consumption. Its characteristics are as follows:
1. Wide frequency modulation range.
2. High precision and high stability.
3. Low jitter or low phase noise.
Note: The jitter of the VCXO output signal directly affects the design of other circuits, and it is usually desirable for the jitter of the VCXO to be as small as possible.