Apparatus and methods for oscillation suppression of cascode power amplifiers
AssigneeSkyworks Solutions, Inc.
InventorJohn William Mitchell Rogers
Life of this patent
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Abstract
Apparatus and methods for oscillation suppression of cascode power amplifiers are provided herein. In certain implementations, a power amplifier system includes a cascode power amplifier including a plurality of transconductance devices that operate in combination with a plurality of cascode devices to amplify a radio frequency input signal. The power amplifier system further includes a bias circuit that biases the plurality of cascode devices with two or more bias voltages that are decoupled from one another at radio frequency to thereby inhibit the cascode power amplifier from oscillating.
Claims20
A power amplifier system comprising:
- an input terminal configured to receive a radio frequency input signal;
- an output terminal;
- a cascode power amplifier including a plurality of transconductance devices each electrically coupled to the input terminal, and a plurality of cascode devices each electrically coupled to the output terminal, the plurality of transconductance devices configured to operate in combination with the plurality of cascode devices to amplify the radio frequency input signal;
- and
- a bias circuit configured to bias the plurality of cascode devices with two or more bias signals that are decoupled from one another at radio frequency so as to provide oscillation suppression to the cascode power amplifier.
A packaged module comprising:
- a package substrate;
- and
- a semiconductor die attached to the package substrate, the semiconductor die including an input terminal configured to receive a radio frequency input signal, an output terminal, and a cascode power amplifier including a bias circuit, a plurality of transconductance devices each electrically coupled to the input terminal, and a plurality of cascode devices each electrically coupled to the output terminal, the plurality of transconductance devices configured to operate in combination with the plurality of cascode devices to amplify the radio frequency input signal, and the bias circuit configured to bias the plurality of cascode devices with two or more bias signals that are decoupled from one another at radio frequency so as to provide oscillation suppression to the cascode power amplifier.
A wireless communication device comprising:
- a transmitter configured to generate a radio frequency signal;
- a cascode power amplifier system including an input terminal configured to receive the radio frequency signal, an output terminal, a bias circuit, a plurality of transconductance devices each electrically coupled to the input terminal, and a plurality of cascode devices each electrically coupled to the output terminal, the plurality of transconductance devices configured to operate in combination with the plurality of cascode devices to amplify the radio frequency signal to thereby generate an amplified radio frequency signal, and the bias circuit configured to bias the plurality of cascode devices with two or more bias signals that are decoupled from one another at radio frequency so as to provide oscillation suppression;
- and
- an antenna configured to receive the amplified radio frequency signal.
The wireless communication device 18 wherein the two or more bias signals include a plurality of bias voltages operable to separately bias the plurality of cascode devices.
The wireless communication device 18 wherein the plurality of transconductance devices include a plurality of common emitter bipolar transistors, and the plurality of cascode devices include a plurality of common base bipolar transistors.
Dependencies are inferred from the claim text.