Design of low power CMOS operational amplifier with fully differential structure
XIAO Ying-hui
Abstract：In order to reduce the influence of low supply voltage and short channel effect on the amplifier and obtain an amplifier with low voltage and high gain, a fully differential operational transconductance amplifier ( OTA) based on a 65 nm CMOS technology was proposed. A folded-cascode structure with a gain enhancement technology was adopted, which made the amplifier have a rail to rail input and large output swing characteristics and such advantages as high speed, high gain and low power. The circuit simulation results show that the DC gain is 82 dB, the gain bandwidth is 477 MHz and the phase margin is 59°. In addition, the settling time is 10 ns and the settling accuracy is 0. 05% under the normal process angle, while the power consumption is only 4. 8 mW.
Keywords：CMOS integrated circuitgain enhancementoperational transconductance amplifierhigh speedhigh gainlow powerfolded-cascode structurehigh gain bandwidth
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 670-674 )