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A 1.2-V pseudo-diff...
A 1.2-V pseudo-differential OTA with common-mode feedforward in 65-nm CMOS
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- Aamir, Syed Ahmed, 1980- (author)
- Linköpings universitet,Elektroniksystem,Tekniska högskolan,Electronics Systems
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- Wikner, J Jacob, 1973- (author)
- Linköpings universitet,Elektroniksystem,Tekniska högskolan,Electronics Systems
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(creator_code:org_t)
- Institute of Electrical and Electronics Engineers (IEEE), 2010
- 2010
- English.
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In: Proceedings of the 17th IEEE International Conference on Electronics, Circuits, and Systems. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 29-32
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Abstract
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Operational transconductance amplifiers
- differential amplifiers
- feedforward amplifiers
- CMOS analog integrated circuits.
- Electrical engineering
- Elektroteknik
Publication and Content Type
- ref (subject category)
- kon (subject category)
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