Hetero-junction bipolar transistor amplifier control circuit
AssigneeMACOM Technology Solutions Holdings, Inc.
InventorJean-Marc Mourant
Life of this patent
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Abstract
A hetero-junction bipolar transistor (HBT) power amplifier is provided. The HBT power amplifier includes a first transistor, a second transistor and a third transistor, the third transistor being configured to drive a base of the second transistor. The first transistor has a base that is configured to receive a current and a collector that is coupled to a base of the third transistor. The second transistor is an output HBT of the HBT power amplifier. The HBT power amplifier further includes a control circuit configured to provide the current to the base of the first transistor. Related methods of operating an HBT power amplifier are also provided.
Claims22
A hetero-junction bipolar transistor (HBT) power amplifier, comprising:
- a first transistor, a second transistor and a third transistor, the third transistor is configured to drive a base of the second transistor;
- and
- a control circuit,
- wherein the first transistor comprises a base that is configured to receive a current and a collector that is coupled to a base of the third transistor,
- wherein the control circuit is configured to provide the current to the base of the first transistor, and
- wherein the second transistor is an output HBT of the HBT power amplifier.
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A gain-control circuit, comprising:
- a current-mirror circuit including a first transistor, the current-mirror circuit is configured to provide a current to a base of the first transistor,
- wherein the current is based on an input control voltage provided to the gain-control circuit, and
- wherein a gain of the gain-control circuit is a function of the current.
A method of operating a hetero-junction bipolar transistor (HBT) power amplifier, the method comprising:
- varying a gain of the HBT power amplifier by changing a bias current of the HBT power amplifier.
Dependencies are inferred from the claim text.