Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10365224 | Microelectronics Journal | 2015 | 7 Pages |
Abstract
A low-distortion feed-forward MASH24b-24b sigma-delta analog-to-digital converter (ADC) for wireless local area network (WLAN) applications was presented. The converter exhibits improved performances than the ADCs which have been presented to date by adding a feedback factor in the second stage and employing a 2nd-order noise-shaping dynamic element matching (DEM) scheme. The feedback factor induces a zero in the noise transfer function (NTF) and therefore improves the in-band signal to noise and distortion ratio (SNDR) of the modulator. The mismatch-shaping DEM was introduced and applied to the 4-bit DACs in this paper to improve the resolution and linearity of the ADC. Fabricated in a 0.18 μm CMOS process with single 1.8 V supply voltage, the converter achieves a peak SNDR of 85.4 dB over a 10 MHz bandwidth which implies an effective number of bits (ENOB) of 13.90-bit. The spurious free dynamic range (SFDR) is -94 dB for a 1.25 MHz@-6dBFS input signal at 160 MHz sampling frequency. The occupied area is 0.44 mm2 and dissipation power 23.4 mW.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Hardware and Architecture
Authors
Di Li, Yin-Tang Yang, Zuo-Chen Shi, Yang Liu,