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US 7,443,259 B2Granted
Fast VCO band selection by frequency to voltage converter
AssigneeInternational Business Machines Corporation
InventorsKai D. Feng, Anjali R. Malladi
Life of this patent
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Abstract
The invention comprises a phase locked loop that has an input adapted to receive a reference frequency. A phase detector is connected directly to the input, a charge pump is connected directly to the phase detector, and a loop filter is connected directly to the charge pump. Also, a voltage controlled oscillator is connected directly to the loop filter, and is adapted to perform frequency band selection. A band selection circuit is connected to the voltage controlled oscillator.
Claims6
A phase locked loop comprising:
- a voltage controlled oscillator adapted to perform frequency band selection;
- and
- a band selection circuit connected to said voltage controlled oscillator, wherein said band selection circuit provides a band selection signal to said voltage controlled oscillator and comprises:
- two identical frequency to voltage converters connected directly to said feedback frequency divider;
- and
- two voltage dividers connected directly to said frequency to voltage converters.
3 more elements
A phase locked loop comprising:
- an input adapted to receive a reference frequency;
- a phase detector connected directly to said input;
- a charge pump connected directly to said phase detector;
- a loop filter connected directly to said charge pump;
- a voltage controlled oscillator connected directly to said loop filter, wherein said voltage controlled oscillator is adapted to perform frequency band selection;
- and
- a band selection circuit connected to said voltage controlled oscillator, wherein said band selection circuit provides a band selection signal to said voltage controlled oscillator and consists of:
- only one feedback frequency divider connected directly to said voltage controlled oscillator;
- only two identical frequency to voltage converters connected directly to said feedback frequency divider;
- only two voltage dividers connected directly to said frequency to voltage converters;
- only two comparators connected directly to said voltage dividers;
- and
- only one logical AND device connected directly to said comparators.
10 more elements
Dependencies are inferred from the claim text.