A New MOS Linear Operational Transconductance Amplifier and Its Application to OTA-C Filters

Takahiro INOUE  Fumio UENO  Mikio KAWASAKI  Yoshinori ARAMAKI  Sonoe NODA  

IEICE TRANSACTIONS on Electronics   Vol.E75-C   No.1   pp.81-89
Publication Date: 1992/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Electronics
operational transconductance,  amplifiers,  active filters,  

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A new MOS linear operational transconductance amplifier (OTA) for the up-to-4 MHz range OTA-C filters is proposed. The proposed OTA is designed using a new linearizing technique based on bias-current modulation, to compensate nonlinearities in the transfer characteristic of the conventional current-source-biased source-coupled pair. The design and SPICE simulation are presented in detail, assuming the implementation by the typical p-well CMOS process. The simulation of a 3.58 MHz OTA-C band-pass filter built with the proposed OTAs showed close agreement with the desired performance.