Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1993-05-20
1994-01-25
Pascal, Robert J.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 34, 331 57, 331 25, 328 55, 328155, 307262, H03K 500, H03B 100
Patent
active
052819272
ABSTRACT:
A phase lock loop operates independent of temperature and process variation by digitally loading a VCO until reaching the desired operating frequency. The VCO reaches a high output frequency even under worst case processing by controlling multiple current mirrors to increase inverter switching current without slowing the response of the VCO to changes in loop node voltage. An Initialize-to-VDD circuit sets the loop node voltage to V.sub.DD so that the load control circuit need only increase loading to slow down the VCO to the desired operating frequency. A frequency range detector monitors the output frequency of the VCO and passes control signals to a load control circuit to activate digital loads and slow down the VCO to the desired operating frequency.
REFERENCES:
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patent: 5012142 (1989-07-01), Sonntag
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patent: 5081429 (1992-01-01), Atriss et al.
patent: 5136260 (1991-03-01), Yousefi-Erezi
patent: 5180994 (1993-01-01), Martin et al.
patent: 5191295 (1992-03-01), Necoechea
Atkins Robert D.
Codex Corp.
Kinkead Arnold M.
Pascal Robert J.
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