When voltage is applied to a Voltage-Controlled Oscillator (VCO), the oscillator generates a tunable output frequency based on the control voltage. The varactor diode adjusts its capacitance, altering the resonant frequency of the LC tank circuit, which in turn changes the output frequency. VCOs are... read more

When voltage is applied to a VCXO (Voltage-Controlled Crystal Oscillator), it powers up internal circuits, initiates crystal oscillation, and adjusts the output frequency based on an external control voltage. A varactor diode modifies the crystal’s capacitance, enabling precise frequency tuning. VCX... read more