Voltage controlled oscillator operating with digital controlled loads in a phase lock loop
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United States of America Patent
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Apr 19, 1994
Grant Date -
N/A
app pub date -
Nov 19, 1992
filing date -
Nov 19, 1992
priority date (Note) -
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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.
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