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A switch-matrix semidigital FIR reconstruction filter for a high-resolution delta-sigma D/A converter  

Song, Yun-Seob (Department of Electronics and Computer Engineering, Korea University)
Kim, Soo-Won (Department of Electronics and Computer Engineering, Korea University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.42, no.7, 2005 , pp. 21-26 More about this Journal
Abstract
An area efficient, low power switch-matrix semidigital FIR reconstruction filter for delta-sigma D/A converter is proposed. Filter coefficients are quantified to 7-bit and 7 current sources that correspond to each coefficient bit are used. The proposed semidigital FIR reconstruction filter is designed in a 0.25 um CMOS process and incorporates 1.5 mm$^{2}$ of active area and a power consumption is 3.8 mW at 2.5 V supply. The number of switching transistors is 1419 at 205 filter order. Simulation results show that the filter output has a dynamic range of 104 dB and 84 dB attenuation of out-of-band quantization noise.
Keywords
Semidigital FIR reconstruction filter; Delta-sigma D/A converter; Audio DAC;
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