A signal-summing programmable gain amplifier employing binary-weighted switching and constant-g--_m bias

作     者：马力 王志功 徐建 Ma Li;Wang Zhigong;Xu Jian

作者机构：东南大学射频光电与集成电路研究所南京210096 

基　　金：The National Natural Science Foundation of China(No.61306069) 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2017年第33卷第2期

页      码：134-139页

摘      要：A novel programmable gain amplifier（ PGA） based on a signal-summing topology is proposed. Different from conventional signal-summing variable gain amplifiers（ VGA）,a binary-weighted switching technique is employed to vary the current-steering transistors＇ aspect ratio to change their transconductance, and hence, an accurate gain step size of 6dB is achieved. The constant-g_m biasing technique and the matching of the transistors and resistors ensures that the gain of the proposed topology is independent of the variation of process, voltage and temperature（ PVT）. P-well NMOS（ Nmetal oxide semiconductor） transistors are utilized to eliminate the influence of back-gate effect which will induce gain *** source-degeneration technique ensures good linearity performance at a low gain. The proposed PGA is fabricated in a0.18 μm CMOS（ complementary metal oxide semiconductor）process. The measurement results show a variable gain ranging from 0 to24 dB with a step size of 6 dB and a maximum gain error of 0. 3dB. A constant 3dB bandwidth of 210 MHz is achieved at different gain settings. The measured output 3rd intercept point（OIP3） and minimum noise figure（ NF） are20. 9 dBm and 11.1 dB, respectively. The whole PGA has a compact layout of 0.068 mm^2. The total power consumption is4. 8 mW under a 1. 8 V supply voltage.

主 题 词：programmable gain amplifier variable gain amplifier signal-summing topology constant-gm 

学科分类：080903[080903] 0809[工学-计算机类] 08[工学] 

核心收录：

D　O　I：10.3969/j.issn.1003-7985.2017.02.002

馆 藏 号：203237092...