An active-rc biquadratic section with reduced sensitivity to operational amplifier imperfections

✍ Scribed by P. Padukone; J. Mulawka; M.S. Ghausi

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 759 KB
• Volume: 310
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(80)90059-9

✦ Synopsis

ABSTRACIY A new active RC biquadratic section using three operational amplifiers (op. amps) and capable of realizing high Q at high frequencies is presented. The circuit has low sensitivity to variations in both the passive components and the op. amp gainbandwidth products (GB). Compared to some existing circuits which require well-matched op. amps to achieve low sensitivity to GB, the proposed circuit has the important advantage of being insensitive to GB variations even if the op. amps are non-identical. 'The influence of the finite open loop d.c. gain and finite GB of the op. amps on the proposed design is examined. The new realization is then compared to those available in the literature, such as the circuits due to Kerwin-Huelsman-Newcomb, Akerberg-Mossberg, Mikhael-Bhattacharyya, Tamty-Ghausi, and Wilson-Bedri-Bowron. Finally, some experimental results are provided to verify the theory.