Bias circuit and power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorYuri Honda
Life of this patent
Estimating the term…
Abstract
A bias circuit includes: a first transistor having an emitter or a source which supplies a bias to an amplifier operating by a power source voltage through a first resistive element and a base or a gate; a first capacitor having a first end electrically connected to the base or the gate of the first transistor and a second end connected to a ground; and a second transistor having a collector or a drain electrically connected to the base or the gate of the first transistor, a base or a gate electrically connected to the base or the gate of the first transistor, and an emitter or a source connected to a node which is supplied with a signal with experience of being amplified by the amplifier and the power source voltage.
Claims15
A bias circuit comprising:
- a first transistor having an emitter or a source and a base or a gate, the first transistor being configured to supply a bias from the emitter or the source to an amplifier through a first resistive element;
- a first capacitor having a first end electrically connected to the base or the gate of the first transistor, and a second end connected to ground;
- and
- a second transistor having a collector or a drain electrically connected to the base or the gate of the first transistor, a base or a gate electrically connected to the base or the gate of the first transistor, and an emitter or a source connected to a node, the node being supplied with a signal having been amplified by the amplifier, and the node being electrically connected to a power source voltage of the amplifier.
A bias circuit comprising:
- a first transistor having an emitter or a source and a base or a gate, the first transistor configured to supply a bias current from the emitter or the source of the first transistor to an amplifier through a first resistive element;
- and
- a bypass circuit between the base or the gate of the first transistor and a node, and that is configured to feed a part of the bias current to the node when a voltage of the node is less than a predetermined threshold,
- wherein the node is supplied with a signal having been amplified by the amplifier, and wherein the node is electrically connected to a power source voltage of the amplifier.
Dependencies are inferred from the claim text.