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Single Boost converter has several limitations in driving a long LED string although it can have perfect current match between each LED. Extreme duty cycle and low efficiency are the two major drawbacks. In this paper, a high efficiency step-up DC-DC converter with high voltage gain for LED backlighting applications is proposed. Without using a transformer, a multi-modes charge-pump is cascaded with...
This letter uses the fanout-of-4 (FO4) metric to analyze the semiconductor process (SP) dependent maximal switching frequency (MSF) of a digital pulsewidth modulator (DPWM). After discussing the choke effect in a self-oscillating hybrid (SOH) DPWM and its impact on MSF, this letter further shows that separating the voltage-controlled oscillator (VCO) and the delay mux line is an effective way to relax...
This paper presents a transistor level design of a novel envelope modulator structure using a high efficiency voltage doubler followed with a buck DC-DC converter for polar modulation. In order to let the output voltage of the buck converter follows the fast changing EDGE (Enhancement Data-rate for GSM Evolution) reference signal, current mode control and 10 MHz switching frequency are implemented,...
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