Differential input circuit
First Claim
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1. A differential input circuit, comprising:
- a first constant current source of a current mirror type which generates a positive current;
a second constant current source of a current mirror type which generates a negative current; and
a current switch which includes a differential amplifier circuit and is connected to a positive input, a negative input, and said first and second constant current sources so that an operating point of said differential amplifier circuit can be changed.
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Abstract
A differential input circuit which can positively operate over a wide input range is provided. The differential input circuit includes a first constant current source of a current mirror type which generates a positive current and a second constant current source of a current mirror type which generates a negative current. The first and second constant current sources constitute a differential amplifier circuit. A current switch which is connected to a positive input and a negative input is also connected to said first and second constant current sources so that an operating point of the differential amplifier circuit can be changed.
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Citations
10 Claims
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1. A differential input circuit, comprising:
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a first constant current source of a current mirror type which generates a positive current;
a second constant current source of a current mirror type which generates a negative current; and
a current switch which includes a differential amplifier circuit and is connected to a positive input, a negative input, and said first and second constant current sources so that an operating point of said differential amplifier circuit can be changed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
a bypass circuit which allows a flow of a small current between said first and second constant current sources.
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9. The differential input circuit as claimed in claim 8, wherein said bypass circuit comprises a resistor.
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10. The differential input circuit as claimed in claim 8, wherein said bypass circuit comprises a transistor.
Specification