带共模反馈的CMOS折叠式高增益运算放大器.PDF

32 12 Vol. 32, . 12 2005 12 Applied Science and Technology Dec. 2005 : 1009- 671X(2005) 12- 0016- 03 CMOS 刘婷婷, 喻明艳 ( 哈尔滨工业大学 微电子学与固体电子学系, 黑龙江 哈尔滨 150001) : 5V . 2.5 V , 90 dB , 45, 33 MHz. : ; ; ; CMOS :TN432 : A High gain CMOS folded operational amplifier with common_mode feedback IU T ing_ting, YU Ming_yan ( Department of Microelectronic Technology and Solid Electrons Science, Harbin Institute of T echnology, Harbin 150001, China) Abstract: This paper presents a two_stage folded operational amplifier with common_mode feedback structure, which is supplied by a single 5 V power source. The input common_mode feedback structure of the folded opera- tional amplifier outputs common_mode current level at almost 2. 5 V. With this structure, the gain is more than 90dB and phase margin can reach 45, while the gain bandwidth is 33 MHz. Keywords: common_mode feedback; high gain; folded operational amplifier; CMOS technology bias1a , bias2a , bias3a , bias4a . , CMFB , outp 1outn 1 1 , . . , [ 1- 3] , . CMOS , . Corner . 1 两级运算放大器分析 , 1 , . 1 . , , . 1 2 . 1, 2 : , 1, : 2005- 08- 29. : ( 1982- ) , , , : . 12 , : CMOS 17 I D VDS VDS A = A v 1 A v 2 . g m = VGS V , ro = I D , g mb = I D . DS, const