← 返回 JSSC 论文列表JSSC 2008第9期RF & Wireless0.18μm CMOS
A 48860 MHz CMOS Low-IF Direct-Conversion DTV Tuner
一款无需外接谐波抑制和镜像滤波器的CMOS低中频直接转换DTV调谐器
4-7dB系统噪声系数, 86dBm灵敏度, 31.5dB MER, 750mW功耗
低中频直接转换DTV调谐器CMOS数字LMS
▸采用复杂I/Q多相混频技术抑制三次谐波混频72dB
▸数字LMS镜像相关算法减少镜像泄漏61dB
▸全局AGC方案保持下变频混频器信号电平恒定
Abstract
A CMOS low-IF direct-conversion digital TV (DTV)
tuner needs no off-chip harmonic rejection and image filters
to receive both terrestrial and cable TV channels in the 48 to
860 MHz frequency range. Complex in-phase and quadrature
(I/Q) poly-phase mixing together with coarse active RF filtering
suppresses the third-harmonic mixing by 72 dB, and a digital LMS
image correlation algorithm reduces the image leakage by 61 dB.
A global AGC scheme keeps the signal level in the down-conver-
sion mixer cons