An overview of feed-forward design techniques for high-gain wideband operational transconductance amplifiers uri icon

abstract

  • In this paper, feed-forward techniques are revised and used for the design of high-frequency operational transconductance amplifiers (OTA). For the same power consumption and similar transistor dimensions, the two- and three-path folded-cascode OTA's present both smaller settling error and faster response as compared to the typical folded-cascode topology. Also, a no-capacitor feed-forward (NCFF) compensation which uses a high-frequency pole-zero doublet to obtain high gain, high GBW and a good phase margin is discussed. The settling-time of the NCFF topology can be faster than that of OTA's with Miller compensation, even if the latter topology uses larger transconductance values. Experimental results for the multi-trajectory OTA's fabricated in the AMI 0.5 m CMOS process demonstrate the feasibility of the feed-forward schemes. 2006 Elsevier Ltd. All rights reserved.

published proceedings

  • Microelectronics Journal

author list (cited authors)

  • Thandri, B. K., & Silva-Martinez, J.

citation count

  • 15

complete list of authors

  • Thandri, Bharath Kumar||Silva-Martinez, Jose

publication date

  • September 2006