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Low Power 10-b 250 Msample/s CMOS Cascaded Folding and Interpolating A/D Converter
Zhi-Yuan CUI Yong-Gao JIN Nam-Soo KIM Ho-Yong CHOI
IEICE TRANSACTIONS on Electronics
Publication Date: 2009/08/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
A/D converter, current mirror, folding, interpolation, CMOS process,
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This paper introduces a new folding amplifier in a folding and interpolating 10-b ADC. The amplifier consists of current mirrors and differential stages. Only one current source is exploited in cascaded differential pairs, which reduces the power consumption significantly. In the folding circuit, the interpolation is implemented with a current division technique. An experiment of the amplifier in 10-b folding signal has been integrated in a single-poly four-metal 0.35 µm CMOS process. The simulation in 10-b folding ADC shows that power consumption is 225 mW at the sampling speed of 250 Msample/s and the power supply of 3.3 V. The preliminary experiment indicates the current steering folder and digital bits operate as expected.