http://www.oscilent.com/catalog/Category/vcxo.htm Oscilent develops and manufactures a complete line of VCXO Products Mon, 18 Mar 2009 14:00:00 GMT Mon, 18 Mar 2009 14:00:00 GMT http://www.oscilent.com/graphics/oscilent_logo.jpg http://www.oscilent.com/catalog/Category/vcxo.htm http://www.oscilent.com/catalog/Category/vcxo.htm A VCXO is Crystal Oscillator, only the output frequency can be adjusted by varying the external control voltage across a varactor diode within the oscillator circuit. The change in frequency versus control voltage is otherwise referred to as pullability. To achieve this adjustment, a VCXO utilizes a variable capacitor (varactor diode) that, when used in series with an internal Quartz Crystal, combined with a change in control voltage, causes the diode capacitance to change. This capacitance change results in a change in the internal Crystal load capacitance thereby resulting in a change in frequency. VCXO's are typically used in phase locked loops (PLLs) for data acquisition or signal regeneration applications, and their inherent capabilities are sometimes referred to as Frequency Modulation. Mon, 18 Mar 2009 14:00:00 GMT