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A novel switching power loss estimation method for modular multilevel converters (MMCs) with the nearest level modulation (NLM) is introduced in this paper. It focuses on the switching actions caused only by change of the inserted submodule (SM) number per arm, named as the essential switching transitions. Every essential switching action can be identified under the assumption of ideal sinusoidal...
Pseudo-differential circuits approximate the performance of fully-differential structures, while allowing single-ended operation of the two half stages in the circuit. This requires duplication of the circuitry, with accurate symmetry needed between the two halves to cancel common-mode noise. This paper proposes a single-ended scheme which uses double sampling and time interleaving to achieve a performance...
A 3rd-order continuous-time ΔΣ modulator with a highly-digital excess loop delay compensation and multi-bit FIR feedback, to be used in an ultrasound beamformer, is presented. A digitally controlled reference switching matrix avoids the power-hungry adder, and allows a power-efficient design of the loop filter. A 2-bit 3-tap FIR feedback DAC optimally achieves lower sensitivity to clock jitter and...
A 3rd-order continuous-time ΔΣ modulator with a highly-digital technique for excess loop delay (ELD) compensation is reported. A digitally controlled reference switching matrix is used to replace the commonly used power-hungry signal adder and extra DAC driving the quantizer. The feedback DAC is embedded in the quantizer, and implemented by a few switches. The proposed technique helps the modulator...
This paper presents a single-inductor dual-output (SIDO) boost DC-DC converter with an adaptive freewheel switching technique. Due to the adoption of freewheel switching duration averaging, the optimal freewheel durations in each phase of the SIDO converter are acquired within one switching cycle. The optimal freewheel switching duration improves the efficiency of the SIDO converter, especially during...
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