Differential input circuit
AssigneeFujitsu Limited
InventorNoriyuki Tokuhiro
Life of this patent
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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.
Claims10
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.
Dependencies are inferred from the claim text.