The frequency synthesizer circuit includes a phase-locked loop (PLL) circuit, a voltage controlled oscillator (VCO), a low pass filter (LPF), an input terminal for providing serial data provided from the exterior to the PLL circuit, an output terminal for providing an oscillation signal provided the...http://www.google.com/patents/US6806782?utm_source=gb-gplus-sharePatent US6806782 - Frequency synthesizer circuit
