Abstract
A low-noise class AB buffer amplifier which has a rail-to-rail output swing while driving large resistive and capacitive loads is presented in this paper along with the test results. The amplifier is fabricated in a 3 /spl mu/m double-polysilicon double-metal CMOS technology and has on-chip frequency compensating capacitors. The basic performance factors obtained in this design are: A/sub 0/=70 dB, GBW=5.5 MHz, SR=7 V//spl mu/s, and /spl upsi//sub n/=10nV//spl radic/Hz@100 kHz. With a supply voltage of /spl plusmn/5 V, the amplifier has a /spl plusmn/4.7 V output swing and features a low 30 /spl Omega/ open-loop output impedance. The total harmonic distortion is at a low -77 dB for a 7V/sub out,pp/ output level with the fundamental frequency of 20 kHz. From the test results, it is demonstrated that an overall high performance is achieved with this design.
Published Version
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