A CMOS class-AB transconductance amplifier for switched-capacitor applications


Rijns, J.J.F. and Wallinga, H. (1990) A CMOS class-AB transconductance amplifier for switched-capacitor applications. In: IEEE International Symposium on Circuits and Systems, ISCAS, 1-3 May 1990, New Orleans, LA, USA.

Abstract:A CMOS operational transconductance amplifier (OTA) using a fully differential single-stage core OTA as the input stage and a differential to single current converter as the output stage, each biased at a separate current level, is presented. A large gain-bandwidth product (2.7 MHz) and a high slew-rate (5 V/¿s) can be obtained by applying a large bias current to the core OTA. Due to the class-AB operation of the output stage, a high output impedance can be obtained by applying a small bias current to the output stage, resulting in a high DC-gain (61.6 dB). When the performance of this class-AB OTA is compared with that of basic single-stage OTAs it is found that the output impedance of the class-AB OTA is increased without limiting the bandwidth or slew-rate
Item Type:Conference or Workshop Item
Copyright:©1990 IEEE
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Link to this item:http://purl.utwente.nl/publications/17035
Official URL:http://dx.doi.org/10.1109/ISCAS.1990.112592
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Metis ID: 113920