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US 6,275,116 B1Granted
Method, circuit and/or architecture to improve the frequency range of a voltage controlled oscillator
AssigneeCypress Semiconductor Corporation
InventorsKhaldoon Abugharbieh, Sung-Ki Min
Life of this patent
Estimating the term…
Abstract
A circuit comprising an oscillator configured to generate a periodic signal in response to (i) control signal and (ii) a current. The current may be varied independently of the control signal. In one example, the oscillator may generate the periodic signal in further response to a second current that may vary in response to the control signal. In another example, the oscillator may be used in a phase-locked loop circuit.
Claims18
A circuit comprising:
- an oscillator configured to generate a periodic signal in response to (i) a control signal configured to vary in response to a resistance and a current mirror output and (ii) a first current configured to vary independently of said resistance;
- and
- a comparator that, in conjunction with said current mirror output, is configured to generate said control signal.
A phase-locked loop circuit (PLL) comprising:
- an oscillator configured to generate a periodic signal in response to (i) a control signal configured to vary in response to a resistance and a current mirror output, (ii) a first current configured to vary independently of said resistance and (iii) a second current that varies in response to said control signal;
- wherein (A) said PLL generates an output signal having a periodic frequency in response to (i) an external reference signal and (ii) said periodic signal and (B) said first current is adjusted after production of said circuit.
A method of generating a periodic signal comprising the steps of:
- (A) generating a variable control signal in response to a resistance, a current mirror output, and a comparator output and
- (B) presenting said variable control signal and a first variable current to an oscillator to generate said periodic signal, said first variable current being variable independent of said resistance.
Dependencies are inferred from the claim text.