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Design of 1 V Operating Fully Differential OTA Using NMOS Inverters
Atsushi Tanaka,Hiroshi Tanimoto 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
A 1 V operating fully differential OTA is presented. We designed a 1 V operating fully differential OTA using NMOS inverters in place of traditional differential pair. To obtain high voltage gain, a two stage configuration has been used in which the first stage has feedforward to cancel common-mode signal and the second stage has commonmode feedback. This OTA was fabricated by 0.18 ㎛ CMOS technology. Measured dc gain is 40 ㏈ and a unity gain frequency is 10 ㎒. This OTA leads a solution to the low supply voltage issue in scaled CMOS analog circuits.