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This paper describes very high frequency (10–200 MHz) switched-mode power converters using custom GaN chips with integrated power switches and gate drivers, allowing standard logic-level PWM control inputs. Circuit design techniques are described in depletion-mode 0.15μm RF and 0.25μm switch GaN-on-SiC processes, including integration of gate-drive and level translation circuits. Operating from up...
This paper presents a method for achieving high-efficiency linear transmitters by codesign of the RF power amplifier (PA), dynamic supply, and signal processing. For varying amplitude signals, the average efficiency of the PA is improved by adding a supply modulator with requirements derived from nonstandard PA modeling. The efficient PA and supply modulator both introduce signal distortion. A targeted...
This paper focuses on a mixed-signal IC realization of a digitally controlled power converter which steps up/down from 2.7-5.5 V to 1-3.6 V for battery powered portable applications. In particular, in this work a Σ-Δ modulated digital pulse-width modulator is combined with a low power second-order multi-bit Σ-Δ ADC in a 0.5 μm CMOS process. It is shown that precise output voltage positioning in buck,...
This paper proposes a multiphase modulator (MPM) for digitally-controlled multiphase buck converters. A recently developed power digital-to-analog converter (DAC) approach allow mismatch-error noise-shaping techniques to be used to build a very simple, hardware-efficient MPM. The proposed modulator is able to generate the control pulses for each phase using a single, low-frequency clock, and to achieve...
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