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.
Claims21
A balun circuit comprising:
- a first differential port;
- a second differential port;
- a single-ended port, a differential signal fed to the first differential port and the second differential port being converted to a single signal output from the single-ended port, and a common output impedance of the single-ended port being transformed from an input impedance of the first and second differential ports;
- a pair of first and second coupled inductors, 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 to the first coupled inductor at the single-ended port and the second coupled inductor at 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 balun circuit comprising:
- a first differential port;
- a second differential port;
- a single-ended port;
- a pair of first and second coupled inductors, the first coupled inductor being connected to the first differential port and to the single-ended port, the second coupled inductor being connected to the second differential port;
- a first capacitor connected from the second differential port to the single-ended port;
- a second capacitor connected to the second coupled inductor;
- and
- a grounded inductor connected to the second capacitor.
A radio frequency amplifier circuit comprising:
- a first amplifier with a first differential output;
- a second amplifier with a second differential output;
- a single-ended output port;
- a pair of first and second coupled inductors, the first coupled inductor being connected to the first differential output of the first amplifier and to the single-ended output port, the second coupled inductor being connected to the second differential output of the second amplifier;
- a first capacitor connected from the second differential output to the single-ended output port;
- a second capacitor connected to the second coupled inductor;
- and
- a grounded inductor connected to the second capacitor.
Dependencies are inferred from the claim text.