Abstract |
- 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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Citation |
- 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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