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US 2018/0006618 A1Published application
Active cross-band isolation for a transformer-based power amplifier
AssigneeSkyworks Solutions, Inc.
InventorsSetu Mohta, Kyu Hwan An
Life of this patent
Estimating the term…
Abstract
Embodiments of radio frequency (RF) systems include a plurality of power amplifiers having a primary winding and a secondary winding. Each of the power amplifiers may be configured to process signals of different frequency bands. The primary winding for one power amplifier can be detuned while another power amplifier is being used in a transmit mode. By detuning the power amplifier, power coupling from the transmitting power amplifier can be reduced or eliminated.
Claims20
A radio frequency device comprising:
- a first power amplifier having a first primary winding and a first secondary winding, the first power amplifier configured in a first transmit mode to amplify a first radio frequency transmit signal received on the first primary winding and provide a first amplified radio frequency transmit signal on the first secondary winding, the first radio frequency transmit signal of a first frequency;
- a second power amplifier having a second primary winding and a second secondary winding, the second power amplifier configured in a second transmit mode to amplify a second radio frequency transmit signal received on the second primary winding and provide a second amplified radio frequency transmit signal on the second secondary winding, the second radio frequency transmit signal of a second frequency that is a harmonic of the first frequency;
- and
- a controller configured, when the first power amplifier is in the first transmit mode, to detune the second power amplifier to reduce power coupling between the first power amplifier and the second power amplifier.
1 more element
A method of operating a wireless device, the method comprising:
- receiving an indication that the wireless device is to transmit using a first frequency;
- turning off a secondary switch in communication with a secondary winding of a power amplifier configured to transmit signals of a second frequency, the second frequency a harmonic of the first frequency;
- configuring a lower core of the power amplifier in an active state;
- and
- configuring an upper core of the power amplifier in an inactive state.
2 more elements
Dependencies are inferred from the claim text.