THE DESIGN OF FULLY DIFFERENTIAL CMOS OPERATIONAL-AMPLIFIERS WITHOUT EXTRA COMMON-MODE FEEDBACK-CIRCUITS

被引：8
|
作者：
LU, PH
WU, CY
TSAI, MK
机构：
[1] UNITED MICROELECTR CORP, HSINCHU, TAIWAN
[2] NATL CHIAO TUNG UNIV, INST ELECTR, HSINCHU 300, TAIWAN
来源：
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 1993年 / 4卷 / 02期
关键词：
D O I：
10.1007/BF01254868
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
A new fully differential CMOS operational amplifier (op amp) without extra common-mode feedback (CMFB) circuit is proposed and analyzed. In this op amp, simple inversely connected current-mirror pairs are used as active loads. From the theoretical analysis, it is shown that the common-mode signal can be efficiently suppressed by the reduced effective common-mode resistance of the active load. The proposed op amp with 2 pF capacitance loadings has an open-loop unity-gain bandwidth of 63 MHz, a phase margin 47-degrees, and a dc gain of 67 dB in 3.5 mum p-well CMOS technology. The common-mode gain at a single output node can be as low as -38 dB without extra CMFB circuit. Experimental results have successfully confirmed the capability of the efficient common-mode rejection.
引用
收藏
页码：173 / 186
页数：14
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