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A CMOS large-swing low-distortion three-stage class AB power amplifier

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4 Author(s)
Op't Eynde, F.N.L. ; Dept. Elektrotech., Katholieke Univ. Leuven, Heverlee, Belgium ; Ampe, P.F.M. ; Verdeyen, L. ; Sansen, W.

A CMOS power amplifier with a class AB rail-to-rail output stage is presented. By using a three-stage amplifier with double Miller compensation, the harmonic distortion of the output stage is suppressed by the internal feedback loops. This approach is thoroughly investigated, and it is shown that a three-stage amplifier has apparent advantages for DC gain, harmonic distortion, and power-supply rejection ratio (PSRR). A realized prototype for ISDN applications with a gain bandwidth (GBW) of 5 MHz and with -80-dB THD at 10 kHz for an output current of 20 mA in a load of 81 Ω is presented

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:25 ,  Issue: 1 )

Date of Publication:

Feb 1990

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