Wide band phase locked loop circuit using narrow band voltage co

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

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327159, 331DIG2, H03L 706

Patent

active

059990244

ABSTRACT:
A wide band phase locked loop using a narrow band voltage controlled oscillator is provided. The wide band phase locked loop circuit includes a frequency and phase detector for generating a signal corresponding to a difference in a frequency and a phase between an input signal and a reference signal and a loop filter for filtering the signal generated by the frequency and phase detector to a predetermined frequency band. The filtered signal from the loop filter is provided to a narrow band voltage controlled oscillator which generates a signal having a frequency varying according to a voltage of the filtered signal, and a level detector which generates dividing ratio control information by detecting a voltage level of the filtered signal. A variable frequency divider generates the reference signal by dividing the signal generated from the voltage controlled oscillator by a dividing ratio determined according to the dividing ratio control information.

REFERENCES:
patent: 4516083 (1985-05-01), Turney
patent: 5325075 (1994-06-01), Rapeli
patent: 5334952 (1994-08-01), Maddy et al.
patent: 5371480 (1994-12-01), Hedberg et al.

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