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US 11,121,686 B2Granted
Amplifier circuit
AssigneeHitachi, Ltd.
InventorsShinya Kajiyama, Tadahiro Nabeta
Life of this patent
Estimating the term…
Abstract
An amplifier circuit includes a potential relation between a common emitter amplifier circuit (amplifier circuit body) including an NPN transistor (bipolar transistor) and a clamp circuit which maintains a potential relation between a base-collector of the NPN transistor of the common emitter amplifier circuit. The clamp circuit includes a level shift circuit and a clamp diode for suppressing a decrease in the collector potential of the NPN transistor of the common emitter amplifier circuit.
Claims8
Amplifier circuit, comprising:
- an amplifier circuit body which includes a bipolar transistor;
- and
- a clamp circuit which maintains a potential relation between a base and a collector of the bipolar transistor of the amplifier circuit body,
- wherein the clamp circuit includes a level shift circuit and a clamp diode which suppresses a decrease in a collector potential of the bipolar transistor of the amplifier circuit body, and
- wherein the level shift circuit has a configuration in which a diode, a resistor, and a constant current source are connected in series.
2 more elements
Amplifier circuit, comprising:
- an amplifier circuit body which includes a bipolar transistor;
- and
- a clamp circuit which maintains a potential relation between a base and a collector of the bipolar transistor of the amplifier circuit body,
- wherein the clamp circuit includes a level shift circuit and a clamp diode which suppresses a decrease in a collector potential of the bipolar transistor of the amplifier circuit body, and
- wherein the clamp diode is configured by a bipolar transistor of an emitter follower.
2 more elements
Amplifier circuit, comprising:
- an amplifier circuit body which includes a bipolar transistor;
- and
- a clamp circuit which maintains a potential relation between a base and a collector of the bipolar transistor of the amplifier circuit body,
- wherein the clamp circuit includes a level shift circuit and a clamp diode which suppresses a decrease in a collector potential of the bipolar transistor of the amplifier circuit body,
- wherein the amplifier circuit body is a differential amplifier having a differential pair,
- wherein the clamp circuit includes a clamp diode corresponding to each of a pair of bipolar transistors included in the differential pair,
- wherein the clamp circuit includes a rectifier circuit provided between each of bases of the pair of bipolar transistors and the level shift circuit, and
- wherein the rectifier circuit selects and outputs one of base potentials of the respective bases.
5 more elements
Amplifier circuit, comprising:
- an amplifier circuit body which includes a bipolar transistor;
- and
- a clamp circuit which maintains a potential relation between a base and a collector of the bipolar transistor of the amplifier circuit body,
- wherein the clamp circuit includes a level shift circuit and a clamp diode which suppresses a decrease in a collector potential of the bipolar transistor of the amplifier circuit body,
- wherein the amplifier circuit body is a differential amplifier having a differential pair,
- wherein the clamp circuit includes a clamp diode corresponding to each of a pair of bipolar transistors included in the differential pair,
- wherein the bipolar transistors included in the differential pair are NPN transistors, and
- wherein the rectifier circuit selects and outputs a higher one of the base potentials.
5 more elements
Dependencies are inferred from the claim text.