Title :
A CMOS large-swing low-distortion three-stage class AB power amplifier
Author :
OP´T Eynde, Frank N L ; Ampe, Patrick F M ; Verdeyen, Lode ; Sansen, Willy M C
Author_Institution :
Dept. Elektrotech., Katholieke Univ. Leuven, Heverlee, Belgium
fDate :
2/1/1990 12:00:00 AM
Abstract :
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
Keywords :
CMOS integrated circuits; compensation; feedback; linear integrated circuits; power amplifiers; 20 mA; 5 MHz; CMOS; DC gain; ISDN applications; class AB; double Miller compensation; harmonic distortion suppression; internal feedback loops; large-swing; low-distortion; power amplifier; power-supply rejection ratio; rail-to-rail output stage; three-stage amplifier; Bandwidth; Capacitors; Feedback loop; Frequency; Harmonic distortion; ISDN; Power amplifiers; Rail to rail amplifiers; Switches; Variable structure systems;
Journal_Title :
Solid-State Circuits, IEEE Journal of
