A High DC Gain Op-Amp for Sample and Hold Circuits

DOI

10.2991/iccsee.2013.446How to use a DOI?

Keywords

operational amplifier, DC gain, unity-gain bandwidth, ADC, CMFB

Abstract

Being a core component of an analog-to-digital converter (ADC), the operational amplifier is expected to provide sufficient DC gain and bandwidth to make the output amplitude less than ½ Least Significant Bit (LSB) in a half clock cycle. However, due to the limitation of the operational amplifiers in DC gain and bandwidth, most ADC is limited to 10-Bit, 100 Million Samples per Second (MSPS) [1-3]. This paper designs a gain-boosted operational amplifier in a 0.18um CMOS technology with a 1.8V supply. It is shown that the proposed amplifier achieves 89.8dB gain and 2.63GHz unity-gain frequency, greatly outperforming competing techniques. In addition, the proposed amplifier supports 12-Bit resolution. Compared to other amplifiers with similar architecture, this one has a lower cost.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Biao Li
PY  - 2013/03
DA  - 2013/03
TI  - A High DC Gain Op-Amp for Sample and Hold Circuits
BT  - Proceedings of the 2nd International Conference on Computer Science and Electronics Engineering (ICCSEE 2013)
PB  - Atlantis Press
SP  - 1781
EP  - 1784
SN  - 1951-6851
UR  - https://doi.org/10.2991/iccsee.2013.446
DO  - 10.2991/iccsee.2013.446
ID  - Li2013/03
ER  -