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High performance operational transconductance amplifier (OTA) structures for high-speed, low-voltage, switched-capacitor (SC) 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 complementary folded cascode feedforward compensated (CFCFC) 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. The optimization strategy was verified by measuring fabricated CFCFC OTA and sigma-delta modulator. The measurement results demonstrate a good agreement with the simulations
Published in:
Instrumentation and Measurement, IEEE Transactions on
(Volume:50
,
Issue:
6
)
Date of Publication: Dec 2001
- Page(s):
- 1665 - 1671
- ISSN :
- 0018-9456
- INSPEC Accession Number:
- 7187100
- Digital Object Identifier :
- 10.1109/19.982965
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Dec 2001
- Sponsored by :
- IEEE Instrumentation and Measurement Society
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