High gain RF power amplifier with negative capacitor
AssigneeSkyworks Solutions, Inc.
InventorsOleksandr Gorbachov, Lisette L. Zhang, Lothar Musiol
Life of this patent
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Abstract
A radio frequency (RF) power amplifier circuit includes an input and an output. A power amplifier transistor has a first terminal connected to the input, a second terminal connected to the output, and a third terminal defined by a degeneration inductance. A first capacitor is connected to the third terminal of the power amplifier transistor, along with a negative capacitance circuit connected in series with the first capacitor. The negative capacitance and the first capacitor define a series resonance at a predefined operating frequency band, which shunts the degeneration inductance of the third terminal.
Claims20
A radio frequency power amplifier circuit for a predefined operating frequency band, the radio frequency power amplifier circuit including an input and an output, comprising:
- a power amplifier transistor with a first terminal connected to the input, a second terminal connected to the output, and a third terminal defined by an inductance;
- a first capacitor connected to the third terminal of the power amplifier transistor;
- and
- a negative capacitance circuit connected to the third terminal in series with the first capacitor, the negative capacitance circuit and the first capacitor defining a series resonance at the predefined operating frequency band, and the inductance of the third terminal being shunted by the negative capacitance circuit and the first capacitor.
A radio frequency front end circuit for a predefined operating frequency band, the radio frequency front end circuit including a circuit input and a circuit output, comprising:
- a power amplifier with a first terminal connected to the circuit input, a second terminal connected to the circuit output, and a third terminal defined by a degeneration inductance;
- a first capacitor connected to the third terminal of the power amplifier transistor;
- and
- a negative capacitance circuit connected to the third terminal in series with the first capacitor, the negative capacitance circuit including an operational amplifier with a non-inverting input, an inverting input to which the first capacitor is connected, and an output, the negative capacitance circuit together with the first capacitor defining a series resonance at the predefined operating frequency band, and the inductance of the third terminal being shunted by the negative capacitance circuit and the first capacitor.
A radio frequency circuit for a predefined operating frequency band and connectable to a semiconductor package ground via a ground circuit path defining an inductance, the radio frequency circuit comprising:
- a first capacitor connected to the ground circuit path;
- a negative capacitance circuit connected to the ground circuit path in series with the first capacitor, the negative capacitance circuit including an operational amplifier with a non-inverting input, an inverting input to which the first capacitor is connected, and an output, the negative capacitance circuit together with the first capacitor defining a series resonance at the predefined operating frequency band, and the inductance of the ground circuit path being shunted by the negative capacitance circuit and the first capacitor.
Dependencies are inferred from the claim text.