Crystal oscillator with eprom-controlled frequency trim
AssigneeCypress Semiconductor Corporation
InventorEric N. Mann
Life of this patent
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Abstract
An apparatus comprising a storage circuit, a load circuit and an oscillator circuit. The storage circuit may be configured to store a number of configuration bits configured to provide one or more control signals. The load circuit may be configured to provide a variable magnitude load in response to the one or more control signals. The oscillator circuit may be configured to provide an output signal, where the output signal has (i) a frequency determined in response to the magnitude of the load circuit and (ii) a magnitude generated in response to a current generated in response to an output of a clamp circuit.
Claims13
A circuit comprising:
- a storage circuit configured to store a number of configuration bits configured to provide one or more control signals;
- a load circuit configured to provide a variable magnitude load in response to said one or more control signals;
- and
- an oscillator circuit configured to provide an output signal, wherein said output signal has (i) a frequency determined in response to the magnitude of said load circuit and (ii) a magnitude generated in response to a current generated in response to an output of a clamp circuit.
A method for generating a variable frequency clock signal, comprising the steps of:
- storing a number of configuration bits;
- generating a variable magnitude load in response to said configuration bits;
- generating a current in response to a clamp;
- and
- generating said variable frequency clock signal having (i) a frequency which is dependent on the magnitude of the variable magnitude load and (ii) a magnitude generated in response to said current.
A circuit comprising:
- means for storing a number of configuration bits for generating one or more control signals;
- means for providing a variable magnitude load in response to said one or more control signals;
- and
- means for providing an output signal, wherein said output signal has (i) a frequency determined in response to the magnitude of said variable magnitude load and (ii) a magnitude generated in response to a current generated in response to a clamp.
Dependencies are inferred from the claim text.