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US 7,119,628 B2Granted
Adaptively extending tunable range of frequency in a closed loop
AssigneeIntel Corporation
InventorsAshoke Ravi, Krishnamurthy Soumyanath
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Abstract
A semiconductor device or a circuit includes a controllable oscillator and circuitry that senses a voltage which may control the controllable oscillator and digitally controls a gain compensation, adaptively compensating for a drop in a gain against overall loop gain within a closed loop. In one embodiment, a single supply source may be used to power the closed loop while a variable gain stage that is digitally controllable may adjust the gain in a feed-forward manner based on the drop.
Claims6
A device comprising:
- a controllable oscillator;
- a charge pump coupled to said controllable oscillator;
- a biased current source coupled to said charge pump to control a gain drop off of said charge pump, said current source including a complementary structure including an N-type metal oxide semiconductor and a P-type metal oxide semiconductor stack to either source or sink current based on a control voltage and an N-type metal oxide semiconductor and P-type metal oxide semiconductor to mirror said source or sink current into said charge pump;
- and
- circuitry operably coupled to said controllable oscillator to sense a voltage that controls said controllable oscillator and to digitally control a gain compensation to compensate for a drop off in a gain within a phase-locked loop, said circuitry including:
- a sensing logic to detect the drop in the gain of said controllable oscillator;
- and
- a variable gain stage that is digitally controllable to adjust the gain based on the drop in the feed-forward manner responsive to said sensing logic.
5 more elements
Dependencies are inferred from the claim text.