Frequency range detector

Details Frequency range detector Frequency range detector

1992-11-19

1993-09-21

Kwon, John T.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307526, 377 73, H03L 700

Patent

active

052472159

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:
patent: 3080487 (1963-03-01), Mellott et al.
patent: 3987365 (1976-10-01), Okada et al.
patent: 4277699 (1981-07-01), Brown et al.
patent: 4389643 (1983-06-01), Hill
patent: 4527080 (1985-07-01), Zweig
patent: 4817448 (1989-04-01), Hargarten et al.
patent: 4988901 (1991-01-01), Kamuro et al.
patent: 5121010 (1992-06-01), Hoshizaki et al.
patent: 5128623 (1992-07-01), Gilmore

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