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VCO vs VCXO | difference between VCO and VCXO

The page compares VCO vs VCXO and mentions difference between VCO and VCXO. VCO stands for Voltage Controlled Oscillator and VCXO stands for Voltage Controlled Crystal Oscillator.

VCO

Definition: Oscillator whose frequency is controlled using external input DC voltage is known as VCO. The full form of VCO as mentioned is Voltage Controlled Oscillator.

VCO

They are used in applications where in voltage to frequency conversion is needed. They are also used in FM modulator as well as RF synthesizer design. Refer rf synthesizer design which uses VCO in its applications.
Also refer VCO types and tuning methods >> and VCO tuning constant >> for more information.

Examples of VCO: SN74LS624 from TI and LM566C from National Semiconductor.

VCXO

Definition:It is the oscillator which oscillates as per frequency determined by the crystal and whose output is adjusted by small amount by varying the applied control voltage.

The full form of VCXO as mentioned is Voltage Controlled Crystal Oscillator. The change in crystal output is controlled using DC voltage. In the mobile phone design it is interfaced with DAC. This DAC is connected with micro-controller. Micro-controller provides digital input and DAC produces analog voltage output which controls the VCXO output. Hence any deviation in the frequency is compensated by voltage control pin.

VCXO based clock generators are used in different applications such as ADSL, STB, digital audio/TV etc.
Example of VCXO: MAX9485 Maxim Integrated IC used as VCXO clock generator

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