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Publication Detail
Optimized Active Single-Miller Capacitor Compensation with Inner Half-Feedforward Stage for Very High-Load Three-Stage OTAs
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Marano D, Grasso AD, Palumbo G, Pennisi S
  • Publication date:
  • Pagination:
    1349, 1359
  • Journal:
    IEEE Transactions on Circuits and Systems I: Regular Papers
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
© 2004-2012 IEEE. This paper introduces a new effective single-Miller capacitor compensation topology for three-stage amplifiers with very large capacitive loads, realized through an active-feedback capacitor together with an inner half-feedforward stage. Moreover, an optimized design strategy which profitably exploits the two left half-plane zeros is presented. To improve the amplifier large signal transient response, the topology also includes an external feedforward path, that only marginally affects the frequency compensation, and a novel slew-rate enhancer section. To validate the solutions presented, a three-stage OTA driving a 10-nF load has been designed and implemented in a standard 0.35-\mu\text{m} CMOS technology. The amplifier occupies less than 0.003-mm 2 of die area, provides 2.7-MHz gain-bandwidth product and 0.55-V/\mu\text{s} average slew-rate, while consuming only 25-\mu\text{A} quiescent current.
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