A 200-MHz all-digital QAM modulator and demodulator in 1.2- mu m CMOS for digital radio applications
A 200-MHz all-digital QAM modulator and demodulator in 1.2- mu m CMOS for digital radio applications
复制标题
采用 1.2μm CMOS 封装的 200MHz 全数字 QAM 调制器和解调器，适用于数字无线电应用
DOI：
10.1109/4.104191
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发表时间：
1991
影响因子：
5.4
通讯作者：
H. Samueli
中科院分区：
文献类型：
--
作者：
B. C. Wong;H. Samueli
提出了一种用于实现高比特率数字无线电应用的前端信号处理功能的200 mhz通用全数字正交调制器和解调器。调制器芯片接受一对8b同相和正交数据流，并产生带限中频数字输出。该解调芯片接受数字化中频输入信号并产生一对滤波的同相和正交基带信号。调制器和解调器芯片每个都包含匹配的40分接有限脉冲响应（FIR）平方根奈奎斯特滤波器，可以容纳高达Mbd的符号速率。该调制器芯片可以在256*256点的矩形网格内产生任意信号星座，从而形成一套通用芯片，适用于各种高比特率数字调制解调器设计，使用各种先进的多电平调制格式，如M-ary QAM。这两个芯片都是在1.2 μ m的CMOS工艺中制造的。>
A 200-MHz universal all-digital quadrature modulator and demodulator are presented for implementing the front-end signal processing functions for high-bit-rate digital radio applications. The modulator chip accepts a pair of 8-b in-phase and quadrature data streams and generates a band-limited IF digital output. The demodulator chip accepts a digitized IF input signal and generates a pair of filtered in-phase and quadrature baseband signals. The modulator and demodulator chips each incorporate matched 40-tap finite-impulse-response (FIR) square-root Nyquist filters and can accommodate symbol rates up to Mbd. The modulator chip can generate any arbitrary signal constellation within a rectangular grid of 256*256 points, thus resulting in a generic chip set suitable for a wide variety of high-bit-rate digital modem designs using various advanced multilevel modulation formats such as M-ary QAM. Both chips were fabricated in a 1.2- mu m CMOS process. >