Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1988-05-31
1989-07-18
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 16, 331 25, H03L 718
Patent
active
048497142
ABSTRACT:
The frequency setting data for setting a preset voltage of a VCO and a frequency dividing ratio of a frequency divider are latched in a data register. A control section includes two registers for latching the data latched in the data register, and a control circuit for determining the latch timings of the registers. One register supplies the latched data to the frequency divider. Another register supplies the latched data through a D/A converter to the VCO. When new frequency setting data is set in the data register, the control circuit delays the frequency setting data latched in the data register by at least one period of the reference signal with respect to the latching time, and supplies it simultaneously to the registers.
REFERENCES:
patent: 4714899 (1987-12-01), Kurtzman et al.
Nishiyama Hitoshi
Takahashi Hiroshi
Anritsu Corporation
Mis David
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