Variable frequency system having linear combination of charge pu

Details Variable frequency system having linear combination of charge pu Variable frequency system having linear combination of charge pu

1987-08-03

1989-10-03

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

048719790

ABSTRACT:
A phase locked loop system having a non-linear voltage controlled oscillator (VCO) is provided with a variable gain charge pump. The charge pump supplies a pump current to an integrating network which transforms the pump current into a frequency-modulating input voltage. The frequency-modulating input voltage is applied to an input of the VCO. The frequency-modulating input voltage is also coupled to a gain control input of the variable gain charge pump so that the magnitude of the pump current will be a function of the absolute value of the frequency-modulating voltage.
A substantially constant loop gain may be obtained in the phase locked loop system by arranging the gain function of the variable gain charge pump in counterposed relation to the slope of a VCO transfer function defining the nonlinear relation between the frequency-modulating input voltage of the VCO and the output frequency of the VCO.

REFERENCES:
patent: 3931588 (1976-01-01), Gehweiler
patent: 4473762 (1984-09-01), Iwahashi
patent: 4649353 (1987-03-01), Sonnenberg

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