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US 12,531,572 B2Granted
Combined IQ-polar radio frequency digital-to-analog-converter (RFDAC) systems and methods
AssigneeApple Inc.
InventorsBevin G Perumana, Saikat Sarkar, Tirdad Sowlati
Life of this patent
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Abstract
A combined radio frequency (RF) digital-to-analog converter (DAC) may include an in-phase and quadrature-(IQ-) based DAC to generate a phase component of an output RF signal and a polar-based DAC to generate an amplitude component of the RF signal. Additionally, modulation circuitry may combine the amplitude component and the phase component to generate the output RF signal.
Claims20
A combined radio frequency digital-to-analog converter (RFDAC) comprising:
- an in-phase and quadrature-(IQ-) based DAC configured to generate a phase component of an output RF signal and an amplitude component of the output RF signal based on the combined RFDAC operating in a first mode of operation;
- and
- a polar-based DAC comprising a plurality of digital power amplifiers, the polar-based DAC configured to generate the amplitude component of the output RF signal based on the combined RFDAC operating in a second mode of operation and based on disabling a set of digital power amplifiers of the plurality of digital power amplifiers, the first mode being associated with a lower output power of the output RF signal than the second mode.
A method comprising:
- generating, via a polar amplitude digital-to-analog converter (DAC) portion of an in-phase and quadrature-(IQ-) polar radio frequency (RF) DAC, an analog amplitude component of an output RF signal based on digital amplitude information when the IQ-polar RFDAC is operating in a first mode and based on disabling one or more digital power amplifiers;
- and
- generating, via an IQ RFDAC portion of the IQ-polar RFDAC, an analog phase component and the analog amplitude component of the output RF signal based on digital phase information when the IQ-polar RFDAC is operating in a second mode, the first mode being associated with a higher output power of the output RF signal than the second mode.
Radio-frequency (RF) transmission circuitry comprising:
- first digital-to-analog converter (DAC) circuitry configured to generate a phase modulated signal at a carrier frequency of an RF output signal of the RF transmission circuitry based on digital data indicative of the RF output signal, the phase modulated signal comprising a consistent amplitude based on the RF transmission circuitry operating in a first mode and comprising the RF output signal based on the RF transmission circuitry operating in a second mode, the first mode being associated with a higher output power of the output RF signal than the second mode;
- and
- second DAC circuitry comprising a plurality of digital power amplifiers, the second DAC circuitry configured to
- generate the RF output signal based on the digital data, the phase modulated signal, and the RF transmission circuitry operating in the first mode,
- generate an amplitude component of the output RF signal based on disabling at least one digital power amplifier of the plurality of digital power amplifiers, and
- be disabled based on the RF transmission circuitry operating in the second mode.
3 more elements
Dependencies are inferred from the claim text.