A Fourth Order Bandpass Delta-Sigma Modulator with Digitally Programmable Passband Frequency

被引：6
|
作者：
Ronald F. Cormier
Roberto H. Bamberger
Terry L. Sculley
机构：
[1] Motorola Land Mobile Products Sector,School of Electrical Engineering and Computer Science
[2] Washington State University,undefined
[3] Crystal Semiconductor Corporation,undefined
来源：
Analog Integrated Circuits and Signal Processing | 1997年 / 12卷 / 3期
关键词：
data conversion; delta-sigma modulation; analog-digital conversion;
D O I：
10.1023/A:1008245424801
中图分类号：
学科分类号：
摘要：
The design and implementation of a fourth order switched-capacitorbandpass delta-sigma modulator with digitally programmable passbandis described. The quantization noise null can be programmed from0.4π (0.2f_s) to 0.6π(0.3f_s) in steps of 0.01π (f_s/200)by changing digital switch settings. This design enables theA/D conversion of a bandpass signal with digital tuning of thecenter frequency for application in systems such as a transceiverIF stage. The modulator IC measures 4.8mm2 in a2µ m CMOS process and achieves an SNR of 47 and59 dB over a 0.01π bandwidth at sampling ratesof 2.358 MHz and 1.25 MHz, respectively.
引用
收藏
页码：217 / 229
页数：12
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