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APN1012: VCO designs for wireless handset and CATV set-top applications

Posted: 27 Apr 2007     Print Version  Bookmark and Share

Keywords:VCO  RF design  oscillator  varactor  varactor-controlled oscillator 

Due to the demand of band coverage by RF applications, most of the free running oscillators have become varactor-controlled oscillators (VCOs). The use of VCO together with the first PLL circuit realises band coverage which requires two sources of RF power. The reference source frequency is generally a VCXO or TCXO, while the other frequency is controlled by the PLL phase detector. The applications include wireless handset and CATV STBs.

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