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US 6,294,962 B1Granted
Circuit(s), architecture and method(s) for operating and/or tuning a ring oscillator
AssigneeCypress Semiconductor Corporation
InventorMonte F. Mar
Life of this patent
Estimating the term…
Abstract
A current source and a load circuit. The oscillator circuit may be configured to present an output signal having a frequency in response to (i) a current, (ii) a load, and (iii) an input signal. The current source may be configured to generate the current in response to one or more first control signals. The load circuit may be configured to generate the load in response to one or more second control signals.
Claims20
A circuit comprising:
- an oscillator circuit configured to present an output signal having a frequency in response to (i) a current, (ii) a load, and (iii) an input signal;
- a current source configured to generate said current in response to one or more first control signals, wherein a variation of said current calibrates said frequency by setting a coarse frequency;
- and
- a digital to analog converter configured to generate said load in response to one or more second control signals, wherein a variation of said one or more second control signals calibrates said frequency by setting a fine frequency.
1 more element
A circuit comprising:
- means for generating an output signal having a frequency in response to (i) a current, (ii) a load, and (iii) an input signal;
- means for generating said current in response to one or more first control signals generated by a programmable element, wherein a variation of said current calibrates said frequency by setting a coarse frequency;
- and
- means for generating said load in response to one or more second control signals, wherein a variation of said one or more second control signals calibrates said frequency by setting a fine frequency.
1 more element
A method for generating a signal having an output frequency of oscillation that is temperature insensitive comprising the steps of:
- (a) generating said output signal having said output frequency in response to (i) a current, (ii) a load, and (iii) an input signal;
- (b) generating said current in response to one or more first control signals generated by a programmable element, wherein a variation of said current calibrates said frequency by setting a coarse frequency;
- and
- (c) generating said load in response to one or more second control signals, wherein a variation of said one or more second control signals calibrates said frequency by setting a fine frequency.
1 more element
A circuit comprising:
- an oscillator circuit configured to present an output signal having a frequency in response to (i) a current, (ii) a load, (iii) a reference voltage, and (iv) an input signal;
- a current source configured to generate said current in response to one or more first control signals generated by a programmable element, wherein a variation of said current calibrates said frequency by setting a first frequency;
- and
- a load circuit configured to generate said load in response to one or more second control signals, wherein a variation of said one or more second control signals calibrates said frequency by setting a second frequency.
1 more element
Dependencies are inferred from the claim text.