Hybrid control of phase locked loops

Details Hybrid control of phase locked loops Hybrid control of phase locked loops

2007-02-13

2007-02-13

Nguyen, Duc M. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S264000, C455S076000, C331S017000, C375S376000

Reexamination Certificate

active

10885909

ABSTRACT:
A hybrid digital and analog phase locked loop. A voltage controlled oscillator is provided, having a fine tune input, a coarse tune input and an output. A frequency divider has an input connected to receive a signal provided by the output of the voltage controlled oscillator, and has an output for providing a signal having a frequency that is divided with respect to a signal provided to its input. A phase detector is connected to receive a reference input signal having a reference frequency at a first input thereof and is connected to receive the signal provided by the output of the frequency divider. The phase detector has an output for providing a phase error signal. An analog is circuit configured as a proportional filter and is connected to receive the phase error signal and to provide a fine tune signal at the fine tune input of the voltage controlled oscillator. A digital integrator is connected to receive the phase error signal and to provide a coarse tune signal at the coarse tune input of the voltage controlled oscillator.

REFERENCES:
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patent: 6380810 (2002-04-01), Sutton
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patent: 6407641 (2002-06-01), Williams et al.
patent: 6597249 (2003-07-01), Chien et al.
patent: 6639476 (2003-10-01), Sullivan
patent: 2004/0000936 (2004-01-01), McCollum et al.

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