Jae-young Shin

A 2W, 92% efficiency and 0.01% THD+N class-D audio power amplifier for mobile applications, based on the novel SCOM architecture

This paper presents a high power efficient class-D audio power amplifier. The proposed class-D amplifier adopts the synchronized controlled oscillation modulator (SCOM), which is suitable for mobile applications. The THD+N at half the maximum output power is below 0.01% and the efficiency is better than 92% in an 8 /spl Omega/ speaker load. The one-chip integrated circuit is implemented in a 0.35 /spl mu/m CMOS technology, with a supply voltage range of 1.6 V-3.6 V. it occupies a chip area of 1.2/spl times/1.2 mm/sup 2/ and dissipates only 1.3 mA at idle.

3.3-V baseband Gm-C filters for wireless transceiver applications

In this paper, we designed 3.3-V receiver/transmitter transconductance-C (Gm-C) filters for baseband analog front-end of wireless transceiver applications. The receiver filter consists of the 6/sup th/-order Gm-C filter including the 2/sup nd/-order group delay equalization. The filter on the transmitter path consists of the 5/sup th/-order Gm-C filter. Both filters are equipped with relevant input/output buffers and on-chip frequency tuning circuit. The filters are fabricated and verified through measurements in a 0.18-/spl mu/m CMOS technology.