Amplifier, driving method for amplifier, and electronic circuit system

An amplifier, comprising a variable shunt circuit including

• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to a control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit,
• the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a MOS transistor of one of an N-type and a P-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include a source,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a drain,
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a gate, and
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group.

An amplifier, comprising variable shunt circuit including

• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to a control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit,
• the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a bipolar transistor of one of an NPN-type and a PNP-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include an emitter,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a collector, and
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a base, and
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group.

A driving method for an amplifier, the amplifier including a variable shunt circuit including

• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to a control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit,
• the driving method for the amplifier comprising:
• causing the amplifier to amplify the input signal under exclusive control from the control circuit on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group.

An amplifier, comprising a variable voltage-current conversion circuit including

• a first transistor group configured to perform a voltage-current conversion, and
• a second transistor group provided correspondingly to the first transistor group and configured to perform a voltage-current conversion,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by a control circuit,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to an input terminal to which an input signal is input,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the input terminal,
• wherein the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a MOS transistor of one of an N-type and a P-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include a source,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a drain,
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a gate, and
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the first switching element connected directly or indirectly to the at least one transistor of the first transistor group and the second switching element connected directly or indirectly to the at least one transistor of the second transistor group.

An amplifier, comprising a variable voltage-current conversion circuit including

• a first transistor group configured to perform a voltage-current conversion, and
• a second transistor group provided correspondingly to the first transistor group and configured to perform a voltage-current conversion,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by a control circuit,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to an input terminal to which an input signal is input,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the input terminal,
• wherein the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a bipolar transistor of one of an NPN-type and a PNP-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include an emitter,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a collector,
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a base, and
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the first switching element connected directly or indirectly to the at least one transistor of the first transistor group and the second switching element connected directly or indirectly to the at least one transistor of the second transistor group.

A driving method for an amplifier, the amplifier including a variable voltage-current conversion circuit including

• a first transistor group configured to perform a voltage-current conversion, and
• a second transistor group provided correspondingly to the first transistor group and configured to perform a voltage-current conversion,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by a control circuit,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to an input terminal to which an input signal is input,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the input terminal,
• wherein the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a MOS transistor of one of an N-type and a P-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include a source,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a drain,
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a gate, and
• the driving method for the amplifier comprising:
• causing the amplifier to amplify the input signal under exclusive control from the control circuit on a pair of the first switching element connected directly or indirectly to the at least one transistor of the first transistor group and the second switching element connected directly or indirectly to the at least one transistor of the second transistor group.

An amplifier, comprising:

• a cascode circuit including
• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to a control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit;
• and
• a variable voltage-current conversion circuit including
• a third transistor group configured to serve as the voltage-current conversion circuit and to perform the voltage-current conversion, and
• a fourth transistor group provided correspondingly to the third transistor group and configured to perform a voltage-current conversion,
• the third transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to the load, and
• a third terminal connected directly or indirectly to an input terminal to which the input signal is input,
• the fourth transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of the power source and the ground, and
• a third terminal connected directly or indirectly to the input terminal,
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group,
• the amplifier being configured to amplify the input signal under exclusive control from the control circuit on a pair of the first switching element connected directly or indirectly to the at least one transistor of the third transistor group and the second switching element connected directly or indirectly to the at least one transistor of the fourth transistor group.

A driving method for an amplifier, the amplifier including:

• a cascode circuit including
• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to a control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit;
• and
• a variable voltage-current conversion circuit including
• a third transistor group configured to serve as the voltage-current conversion circuit and to perform the voltage-current conversion, and
• a fourth transistor group provided correspondingly to the third transistor group and configured to perform a voltage-current conversion,
• the third transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to the load, and
• a third terminal connected directly or indirectly to an input terminal to which the input signal is input,
• the fourth transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of the power source and the ground, and
• a third terminal connected directly or indirectly to the input terminal,
• the driving method for the amplifier comprising:
• causing the amplifier to amplify the input signal under exclusive control from the control circuit on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group;
• and
• causing the amplifier to amplify the input signal under exclusive control from the control circuit on a pair of the first switching element connected directly or indirectly to the at least one transistor of the third transistor group and the second switching element connected directly or indirectly to the at least one transistor of the fourth transistor group.

An electronic circuit system, comprising:

• an amplifier;
• and
• a control circuit configured to control operations of the amplifier,
• the amplifier including a variable shunt circuit including
• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to the control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit,
• the control circuit being configured to perform exclusive control on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group.

An electronic circuit system, comprising:

• an amplifier;
• and
• a control circuit configured to control operations of the amplifier,
• the amplifier including a variable voltage-current conversion circuit including
• a first transistor group configured to perform a voltage-current conversion, and
• a second transistor group provided correspondingly to the first transistor group and configured to perform a voltage-current conversion,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to an input terminal to which an input signal is input,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the input terminal,
• the at least one transistor of the first transistor group and the at least one transistor of the second transistor group each include a MOS transistor of one of an N-type and a P-type,
• the first terminal of the at least one transistor of the first transistor group and the first terminal of the at least one transistor of the second transistor group each include a source,
• the second terminal of the at least one transistor of the first transistor group and the second terminal of the at least one transistor of the second transistor group each include a drain,
• the third terminal of the at least one transistor of the first transistor group and the third terminal of the at least one transistor of the second transistor group each include a gate, and
• the control circuit being configured to perform exclusive control on a pair of the first switching element connected directly or indirectly to the at least one transistor of the first transistor group and the second switching element connected directly or indirectly to the at least one transistor of the second transistor group.

An electronic circuit system, comprising:

• an amplifier;
• and
• a control circuit configured to control operations of the amplifier,
• the amplifier including
• a cascode circuit including
• a first transistor group, and
• a second transistor group provided correspondingly to the first transistor group,
• the first transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a voltage-current conversion circuit configured to perform a voltage-current conversion of an input signal,
• a second terminal connected directly or indirectly to a load, and
• a third terminal connected directly or indirectly to the control circuit,
• the second transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to the voltage-current conversion circuit,
• a second terminal connected directly or indirectly to one of a power source and a ground, and
• a third terminal connected directly or indirectly to the control circuit;
• and
• a variable voltage-current conversion circuit including
• a third transistor group configured to serve as the voltage-current conversion circuit and to perform the voltage-current conversion, and
• a fourth transistor group provided correspondingly to the third transistor group and configured to perform a voltage-current conversion,
• the third transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a first switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to the load, and
• a third terminal connected directly or indirectly to an input terminal to which the input signal is input,
• the fourth transistor group including at least one transistor that includes
• a first terminal connected directly or indirectly to a second switching element that is controlled by the control circuit,
• a second terminal connected directly or indirectly to one of the power source and the ground, and
• a third terminal connected directly or indirectly to the input terminal,
• the control circuit being configured to perform exclusive control on a pair of the at least one transistor of the first transistor group and the at least one transistor of the second transistor group,
• the control circuit being configured to perform exclusive control on a pair of the first switching element connected directly or indirectly to the at least one transistor of the third transistor group and the second switching element connected directly or indirectly to the at least one transistor of the fourth transistor group.