Method and apparatus to generate an optimum common-mode voltage in analog differential circuits
OwnerIon E. Oprisinventor
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Abstract
A method and apparatus to generate an optimum common-mode voltage in analog differential circuits are described. A first output voltage is generated as a function of a power supply voltage and a positive saturation voltage in a differential amplifier circuit A second output voltage is then generated as a function of a negative saturation voltage in the differential amplifier circuit. An optimum common-mode level output voltage is then calculated as an average of said first output voltage and said second output voltage to obtain a linear output range of said differential amplifier circuit.
Claims20
A method comprising:
- generating a first output voltage as a function of a power supply voltage and a positive saturation voltage in a differential amplifier circuit;
- generating a second output voltage as a function of a negative saturation voltage in said differential amplifier circuit;
- and
- calculating an optimum common-mode level output voltage as an average of said first output voltage and said second output voltage to obtain a linear output range of said differential amplifier circuit.
An apparatus comprising:
- means for generating a first output voltage as a function of a power supply voltage and a positive saturation voltage in a differential amplifier circuit;
- means for generating a second output voltage as a function of a negative saturation voltage in said differential amplifier circuit;
- and
- means for calculating an optimum common-mode level output voltage as an average of said first output voltage and said second output voltage to obtain a linear output range of said differential amplifier circuit.
A circuit comprising:
- a first output generator block to generate a first output voltage as a function of a power supply voltage and a positive saturation voltage in a differential amplifier circuit;
- a second output generator block coupled to said first output generator block to generate a second output voltage as a function of a negative saturation voltage in said differential amplifier circuit;
- and
- an averaging generator block to receive said first output voltage and said second output voltage and to calculate an optimum common-mode level output voltage as an average of said first output voltage and said second output voltage to obtain a linear output range of said differential amplifier circuit.
A method to manufacture a circuit comprising:
- coupling a first output generator block to a second output generator block, said first output generator block to generate a first output voltage as a function of a power supply voltage and a positive saturation voltage in said differential amplifier circuit, and said second output generator block to generate a second output voltage as a function of a negative saturation voltage in a differential amplifier circuit;
- and
- coupling an averaging generator block to said first output generator block and said second output generator block, said averaging generator block to receive said first output voltage and said second output voltage and to calculate an optimum common-mode level output voltage as an average of said first output voltage and said second output voltage to obtain a linear output range of said differential amplifier circuit.
Dependencies are inferred from the claim text.