Designing four-stage operational transconductance amplifiers (OTAs) is often considered a challenging task mainly because of the required non trivial frequency compensation procedure. In this study, starting from the simplest architecture (a differential stage cascaded by three common source stages) a high-performance OTA is demonstrated, outperforming all the (few) previous implementations. Thanks to the frequency compensation scheme and to the adoption of a slew-rate enhancer section, the solution is able to drive large capacitive loads as high as 1 nF, rivaling in terms of bandwidth and speed even with three-stage counterparts, traditionally credited to be better because of the less number of high-impedance nodes. The solution, fabricated in a 0.35- technology, occupies 0.014- with DC consumption of 170 . It also achieves nearly 3-MHz gain bandwidth product while driving the 1-nF load with less than 0.5- 1% settling time
High-Performance Four-Stage CMOS OTA Suitable for Large Capacitive Loads
GRASSO, ALFIO DARIO
Primo
;PALUMBO, Gaetano;PENNISI, Salvatore
2015-01-01
Abstract
Designing four-stage operational transconductance amplifiers (OTAs) is often considered a challenging task mainly because of the required non trivial frequency compensation procedure. In this study, starting from the simplest architecture (a differential stage cascaded by three common source stages) a high-performance OTA is demonstrated, outperforming all the (few) previous implementations. Thanks to the frequency compensation scheme and to the adoption of a slew-rate enhancer section, the solution is able to drive large capacitive loads as high as 1 nF, rivaling in terms of bandwidth and speed even with three-stage counterparts, traditionally credited to be better because of the less number of high-impedance nodes. The solution, fabricated in a 0.35- technology, occupies 0.014- with DC consumption of 170 . It also achieves nearly 3-MHz gain bandwidth product while driving the 1-nF load with less than 0.5- 1% settling timeFile | Dimensione | Formato | |
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