Frequency synthesizer using intermittently controlled phase lock

Details Frequency synthesizer using intermittently controlled phase lock Frequency synthesizer using intermittently controlled phase lock

1993-06-29

1995-01-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 17, 331 25, H03L 7189

Patent

active

053790022

ABSTRACT:
A control voltage coarse adjustment circuit including a D/A converter voltage generator is provided on a load side of a capacitor in a loop filter included in a phase locked loop. For this structure, a coarsely adjusted voltage is generated to be added to a voltage which is generated by the capacitor of the loop filter for the switch-over of channels during a communication frame. The added voltages are applied to a voltage controlled oscillator to change a frequency for the switch-over of channels. Consequently, the charge and discharge of the capacitor is carried out in a short time to suppress the influence of dielectric absorption current. Thus, the intermittent operation of the phase locked loop in which the phase locked loop is closed and opened intermittently is carried out for the saving of electric power consumption, and a carrier frequency is stabilized in the open phase locked loop by an electric charge voltage of the capacitor in the loop filter.

REFERENCES:
patent: 4965533 (1990-10-01), Gilmore
patent: 4977611 (1990-12-01), Maru
Isao Shimizu, et al., NTT Review, "New Digital Mobile Radio Technologies", vol. 4., No. 1, Jan. 1992, Tokyo, Japan, pp. 64-69, XP292915.

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