Complex digital phase locked loop for use in a demodulator...

Details Complex digital phase locked loop for use in a demodulator... Complex digital phase locked loop for use in a demodulator...

2004-11-30

2008-10-28

Wang, Ted (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S326000, C375S376000, C329S325000

Reexamination Certificate

active

07443930

ABSTRACT:
A complex digital phase locked loop for use in a digital demodulator includes a phase detector for producing a phase error indicative of a difference in phase between a complex digital input signal and a complex digital feedback signal. The phase error is input to a controller, which multiplies the phase error by a gain factor selected to stabilize and optimize the phase locked loop and produces an output signal for use in extracting a frequency deviation present in the complex digital input signal. The output signal is also input to a numerically controlled oscillator that tracks the phase of the complex digital input signal based on the output signal and produces the complex digital feedback signal.

REFERENCES:
patent: 5912930 (1999-06-01), Iwasaki
patent: 6310513 (2001-10-01), Iemura

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