Quasi-differential RF power amplifier with high level of harmonics rejection
AssigneeSkyworks Solutions, Inc.
InventorOleksandr Gorbachov
Life of this patent
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Abstract
A quasi-differential amplifier with an input port and an output port. The amplifier has a phase shifter network with a first port connected to the input port, a second port, and a third port. A first amplifier has an input connected to the second port of the phase shifter network, and an output, and a second amplifier has an input connected to the third port of the phase shifter network, and an output. A balun circuit includes a first differential port connected to an output of the first amplifier, a second differential port connected to an output of the second amplifier, and a single-ended port. An output matching network is connected to the single-ended port of the balun circuit and to the output port.
Claims29
A quasi-differential amplifier, comprising:
- an input port;
- an output port;
- a phase shifter network having a first port connected to the input port, a second port, and a third port;
- a first amplifier having an input connected to the second port of the phase shifter network, and an output;
- a second amplifier having an input connected to the third port of the phase shifter network, and an output;
- a balun circuit including a first differential port connected to an output of the first amplifier, a second differential port connected to an output of the second amplifier, a single-ended port, a first pair of first and second coupled inductors with the first coupled inductor being electrically connected to the first differential port and the single-ended port, the second coupled inductor being electrically connected to the second differential port, a first capacitor electrically connected between the first coupled inductor and the single ended port, and to the second coupled inductor and the second differential port, a second capacitor electrically connected to the second coupled inductor, and a grounded inductor electrically coupled in series to the second capacitor;
- a compensation network connected to the output of the second amplifier and the second differential port of the balun circuit;
- and
- an output matching network connected to the single-ended port of the balun circuit and to the output port.
A quasi-differential amplifier, comprising:
- an input port;
- an output port;
- a phase shifter network having a first port connected to the input port, a second port, and a third port;
- a first amplifier having an input connected to the second port of the phase shifter network, and an output;
- a second amplifier having an input connected to the third port of the phase shifter network, and an output;
- a balun circuit including a first differential port connected to an output of the first amplifier, a second differential port connected to an output of the second amplifier, a single-ended port, a first pair of first and second coupled inductors with the first coupled inductor being electrically connected to the first differential port and the single-ended port, the second coupled inductor being electrically connected to the second differential port, a first capacitor electrically connected between the first coupled inductor and the single ended port, and to the second coupled inductor and the second differential port, a second capacitor electrically connected to the second coupled inductor, and a grounded inductor electrically coupled in series to the second capacitor;
- and
- an output matching network connected to the single-ended port of the balun circuit and to the output port, the output matching network including a first network segment tuned to reject second harmonic signal components, and a second network segment tuned to reject fourth harmonic signal components.
Dependencies are inferred from the claim text.