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An optimization approach to designing OTAs for low-voltage sigma-delta modulators

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2 Author(s)
Lampinen, H. ; Digital & Comput. Syst. Lab., Tampere Univ. of Technol., Finland ; Vainio, O.

High performance OTA (Operational Transconductance Amplifier) structures for high-speed, low-voltage, switched-capacitor based sigma-delta modulator applications have been designed utilizing an efficient circuit optimization strategy presented in this paper. The main idea is to use external programs together with a circuit optimizer to construct flexible optimization algorithms. Optimization goals and constraints are derived from analytical equations and application requirements. Using a 0.35 μm CMOS processing technology a CFCFC (Complementary Folded Cascode Feedforward Compensated) OTA with 2.5 V supply obtained 470 MHz unity-gain frequency, 350 V/μs slew rate, over 74 dB gain, and over 70° phase margin using 10 pF load capacitances

Published in:

Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE  (Volume:2 )

Date of Conference:

2000