Oscilátory VCXO

VCXO Oscillators (Voltage-controlled crystal oscillators) are used in designs that need to control the output frequency via an external digital PLL. The VCXO frequency is pulled by the control voltage (Vc) applied. The function of this can be to maintain a fixed desired output frequency over time to counteract the ageing of the crystal that would otherwise cause a drift. The designer/engineer w...