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

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

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)
124 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)13-18
JournalIEE Proceedings Circuits Devices and Systems
Issue number1
Publication statusPublished - 2000


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