Sw. Jung et al., Design and implementation of a fourth-order quadrature band-pass delta-sigma modulator for low-IF receivers, IEICE T FUN, E83A(12), 2000, pp. 2649-2656
Citations number
12
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
The delta-sigma modulator (DSM) is an excellent choice for high-resolution
analog-to-digital converters. Recently, a band-pass DSM has been a desirabl
e choice for direct conversion of an IF signal into a digital bit stream. T
his paper proposes a quadrature band-pass DSM for digitizing a narrowband I
F signal. This modulator can achieve a lower total order. higher signal-to-
noise ratio (SNR), and higher bandwidth when compared with conventional ban
d-pass modulators. An experimental prototype employing the quadrature topol
ogy has been integrated in 0.6 mum, double-poly, double-metal CMOS technolo
gy with capacitors synthesized from a stacked poly structure. This: system
clocked at 13 MHz and digitized a 200 kHz bandwidth signal centered at 4.87
5 MHz with 100 dB of dynamic range. Power consumption is 190 mW at 5 V.