Patent ID: 8513995

Claim:
A system incorporating a phase locked loop circuit, comprising: a voltage controlled oscillator (VCO) having a first input terminal for adjusting characteristics of an output signal and an output terminal on which the output signal is provided; a phase and frequency detector circuitry which generates a first detector signal indicative of a phase difference between the VCO output signal and a reference signal and a second detector signal indicative of a frequency difference between the VCO output signal and the reference signal, the detector circuitry having a first input terminal for receiving the reference signal and a second input terminal for receiving the VCO output signal; a control circuitry coupled to receive the second detector signal and provide a control signal having frequency content in a high frequency range and frequency content in a low frequency range; a first input circuitry responsive to the first detector signal to provide a first VCO input signal indicative of a phase difference; a second input circuitry responsive to the control signal to provide a second VCO input signal indicative of a frequency difference between the VCO output signal and the reference signal; and a third input circuitry which reduces frequency content in the high frequency range of the control signal and responsive to frequency content in the low frequency range of the control signal to provide as input to the VCO a third VCO input signal, wherein the first input circuitry, the second input circuitry and the third input circuitry are coupled to provide all of the first, second and third VCO input signals at the first input terminal of the VCO.