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A Linearization Technique for Differential OTAs

Abdulaziz, Mohammed LU ; Ahmad, Waqas LU ; Törmänen, Markus LU and Sjöland, Henrik LU (2017) In IEEE Transactions on Circuits and Systems II: Express Briefs 64(9). p.1002-1002
Abstract
This brief presents an operational transconductance amplifier (OTA) linearization technique that is applied to a low-noise amplifier (LNA) and an OTA-C filter. Simulations show the effectiveness of the proposed technique on the LNA, whose noise and gain performance remain unaffected while the linearity is significantly improved. Measurements of the 80-MHz fourth order Butterworth OTA-C filter are also presented. It is implemented using six OTAs instead of eight, thus reducing the power consumption and area. The filter is implemented in 65-nm low-power CMOS, with a core area of 0.05 mm 2 and consumes 12.6 mA from 1.2 V supply. The measured in-band noise voltage is below 42 nV/ Hz‾‾‾√ , and the measured third order intercept point... (More)
This brief presents an operational transconductance amplifier (OTA) linearization technique that is applied to a low-noise amplifier (LNA) and an OTA-C filter. Simulations show the effectiveness of the proposed technique on the LNA, whose noise and gain performance remain unaffected while the linearity is significantly improved. Measurements of the 80-MHz fourth order Butterworth OTA-C filter are also presented. It is implemented using six OTAs instead of eight, thus reducing the power consumption and area. The filter is implemented in 65-nm low-power CMOS, with a core area of 0.05 mm 2 and consumes 12.6 mA from 1.2 V supply. The measured in-band noise voltage is below 42 nV/ Hz‾‾‾√ , and the measured third order intercept point improvement using OTA linearization is up to 17 dB in-band and about 3 dB out-of-band. Supply and temperature variation measurements on three samples show that the linearization is effective without a need for bias adjustment. (Less)
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Contribution to journal
publication status
published
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in
IEEE Transactions on Circuits and Systems II: Express Briefs
volume
64
issue
9
pages
1006 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
DOI
10.1109/TCSII.2016.2617920
language
English
LU publication?
yes
id
50cf4179-e101-4e95-9447-250d912824ac
date added to LUP
2017-09-07 12:50:29
date last changed
2017-09-07 13:41:15
@article{50cf4179-e101-4e95-9447-250d912824ac,
  abstract     = {This brief presents an operational transconductance amplifier (OTA) linearization technique that is applied to a low-noise amplifier (LNA) and an OTA-C filter. Simulations show the effectiveness of the proposed technique on the LNA, whose noise and gain performance remain unaffected while the linearity is significantly improved. Measurements of the 80-MHz fourth order Butterworth OTA-C filter are also presented. It is implemented using six OTAs instead of eight, thus reducing the power consumption and area. The filter is implemented in 65-nm low-power CMOS, with a core area of 0.05 mm 2 and consumes 12.6 mA from 1.2 V supply. The measured in-band noise voltage is below 42 nV/ Hz‾‾‾√ , and the measured third order intercept point improvement using OTA linearization is up to 17 dB in-band and about 3 dB out-of-band. Supply and temperature variation measurements on three samples show that the linearization is effective without a need for bias adjustment.},
  author       = {Abdulaziz, Mohammed and Ahmad, Waqas and Törmänen, Markus and Sjöland, Henrik},
  language     = {eng},
  number       = {9},
  pages        = {1002--1002},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Circuits and Systems II: Express Briefs},
  title        = {A Linearization Technique for Differential OTAs},
  url          = {http://dx.doi.org/10.1109/TCSII.2016.2617920 },
  volume       = {64},
  year         = {2017},
}