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Ring Amplifiers for Switched Capacitor Circuits Public Deposited

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  • In this paper the fundamental concept of ring amplification is introduced and explored. Ring amplifiers enable efficient amplification in scaled environments, and possess the benefits of efficient slew-based charging, rapid stabilization, compression-immunity (inherent rail-to-rail output swing), and performance that scales with process technology. A basic operational theory is established, and the core benefits of this technique are identified. Measured results from two separate ring amplifier based pipelined ADCs are presented. The first prototype IC, a simple 10.5-bit, 61.5dB SNDR pipelined ADC which uses only ring amplifiers, is used to demonstrate the core benefits. The second fabricated IC presented is a high-resolution pipelined ADC which employs the technique of Split-CLS to perform efficient, accurate amplification aided by ring amplifiers. The 15-bit ADC is implemented in a 0.18 μm CMOS technology and achieves 76.8 dB SNDR and 95.4 dB SFDR at 20 Msps while consuming 5.1 mW, achieving a FoM of 45 fJ/conversion-step.
  • Keywords: correlated level shifting, analog to digital conversion, analog to digital converter, slew-based, RAMP, rail-to-rail, ring amplification, ADC, CLS, ringamp, A/D, low power, ring amp, scaling, Split-CLS, ring amplifier, high resolution, switched-capacitor, scalability, stabilized ring oscillator, nanoscale CMOS
  • This is the author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by IEEE-Institute of Electrical and Electronics Engineers and can be found at: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4. ©2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
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  • Hershberg, B., Weaver, S., Sobue, K., Takeuchi, S., Hamashita, K., & Moon, U. (2012). Ring amplifiers for switched capacitor circuits. IEEE Journal of Solid-State Circuits, 47(12): 2928-2942.
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  • 47
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  • 12
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  • The authors would like to thank Asahi Kasei Microdevices for supporting this research.
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