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A 1.2-V pseudo-differential OTA with common-mode feedforward in 65-nm CMOS
Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology. (Electronics Systems)
Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology. (Electronics Systems)
2010 (English)In: 17th IEEE International Conference on Electronics, Circuits, and Systems., www.ieee.org , 2010, 29-32 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we describe the implementation of a 1. 2-V pseudo-differential operational transconductance amplifier (OTA) with common-mode feedforward (CMFF) and inher­ent common-mode feedback (CMFB) in a 65-nm, digital CMOS process. The OTA architecture provides an inher­ent CMFB when cascaded OTA structures are utilized andthis work has studied a cascaded amplifier consisting of fourstages. Due to the low-gain using core 65-nm circuit de­vices, the overall gain must be distributed on all four stages to acquire a gain of more than 60 dB, while maintaining a-3-dB bandwidth of 200 MHz. To achieve high gain, we propose using a modified, positive-feedback, cross-coupled input differential stage. The modified OTA achieves a high output swing of ± 0.85 V due to only two stacked transistors, 88 dB DC gain and a third-order harmonic of -60 dB for 800 mVpp at 30 MHz. Further on, in a capacitive buffer configuration, we achieve a high slew rate of 1240 V/µS, -3-dB bandwidth of 509 MHz, signal-to-noise ratio of 63 dB while consuming 10.4 mW power.

Place, publisher, year, edition, pages
www.ieee.org , 2010. 29-32 p.
Keyword [en]
Operational transconductance amplifiers, differential amplifiers, feedforward amplifiers, CMOS analog integrated circuits.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-70358DOI: 10.1109/ICECS.2010.5724446OAI: oai:DiVA.org:liu-70358DiVA: diva2:438499
Available from: 2011-09-02 Created: 2011-09-02 Last updated: 2011-09-06

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Aamir, Syed AhmedWikner, J Jacob

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  • apa
  • harvard1
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