High-frequency two-input CMOS OTA for continuous-time filter applications

Glinianowicz, J.; Jakusz, J.; Szczepanski, S.; Sun, Y.

High-frequency two-input CMOS OTA for continuous-time filter applications

Glinianowicz, J., Jakusz, J., Szczepanski, S. and Sun, Y. (2000) High-frequency two-input CMOS OTA for continuous-time filter applications. IEE Proceedings Circuits Devices and Systems, 147 (1). pp. 13-18. ISSN 1350-2409

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A high-frequency fully differential CMOS operational transconductance amplifier (OTA) is presented for continuous-time filter applications in the megahertz range. The proposed design technique combines a linear cross-coupled quad input stage with an enhanced folded-cascode circuit to increase the output resistance of the amplifier. SPICE simulations show that DC-gain enhancement can be obtained without significant bandwidth limitation. The two-input OTA developed is used in high-frequency tuneable filter design based on IFLF and LC ladder simulation structures. Simulated results of parameters and characteristics of the OTA and filters in a standard 1.2 μm CMOS process (MOSIS) are presented. A tuning circuit is also discussed.

Item Type	Article
Identification Number	10.1049/ip-cds:20000317
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Date Deposited	15 May 2025 11:41
Last Modified	30 Aug 2026 23:01