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http://dx.doi.org/10.4313/JKEM.2002.15.9.743

A 1.5V 70dB 100MHz CMOS Class-AB Complementary Operational Amplifier  

박광민 (순천향대학교 전보기술공학부)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.15, no.9, 2002 , pp. 743-749 More about this Journal
Abstract
A 1.5V 70㏈ 100MHz CMOS class-AB complementary operational amplifier is presented. For obtaining the high gain and the high unity gain frequency, the input stage of the amplifier is designed with rail-to-rail complementary differential pairs which are symmetrically parallel-connected with the NMOS and the PMOS differential input pairs, and the output stage is designed to the rail-to-rail class-AB output stage including the elementary shunt stage technique. With this design technique for output stage, the load dependence of the overall open loop gain is improved and the push-pull class-AB current control can be implemented in a simple way. The designed operational amplifier operates perfectly on the complementary mode with 180$^{\circ}$ phase conversion for 1.5V supply voltage, and shows the push-pull class-AB operation. In addition, the amplifier shows the DC open loop gain of 70.4 ㏈ and the unity gain frequency of 102 MHz for $C_{L=10㎊∥}$ $R_{L=1㏁}$ Parallel loads. When the resistive load $R_{L}$ is varied from 1 ㏁ to 1 ㏀, the DC open loop gain of the amplifier decreases by only 2.2 ㏈.a$, the DC open loop gain of the amplifier decreases by only 2.2 dB.
Keywords
CMOS; Complementary; Operational amplifier; Rail-to-rail; Class-AB;
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Times Cited By KSCI : 4  (Citation Analysis)
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