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A Digitally Assisted Non-Linearity Mitigation System for Tunable Channel Select Filters

Gangarajaiah, Rakesh LU ; Abdulaziz, Mohammed LU ; Sjöland, Henrik LU ; Nilsson, Peter LU and Liu, Liang LU (2016) In IEEE Transactions on Circuits and Systems - II - Express Briefs 63(1). p.69-73
Abstract

This brief presents a low-complexity system for digitally assisting a channel select filter (CSF) to mitigate both even- and odd-order nonlinearities. The proposed solution is scalable and can be utilized for nonlinearity mitigation in different analog transceiver blocks. The system consists of an auxiliary path with a low-resolution analog to digital converter (ADC) enabling digital recreation and measurement of the distortion in the main path and relies on an adaptive digital signal processing algorithm to detect and tune the analog components to their optimal settings. The system provides robustness against process, voltage, and temperature variations, and the digital part requires an equivalent logic of only 42 k gates in CMOS... (More)

This brief presents a low-complexity system for digitally assisting a channel select filter (CSF) to mitigate both even- and odd-order nonlinearities. The proposed solution is scalable and can be utilized for nonlinearity mitigation in different analog transceiver blocks. The system consists of an auxiliary path with a low-resolution analog to digital converter (ADC) enabling digital recreation and measurement of the distortion in the main path and relies on an adaptive digital signal processing algorithm to detect and tune the analog components to their optimal settings. The system provides robustness against process, voltage, and temperature variations, and the digital part requires an equivalent logic of only 42 k gates in CMOS technology, enabling cost-efficient implementation on integrated circuits. The operation of the system has been verified by using a tunable CSF capable of receiving a 10-MHz baseband signal interfaced to an external ADC. The results demonstrate that the proposed system is capable of tuning the CSF to its optimal bias voltage, providing a third-order intermodulation reduction of 14.5 dB.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Adaptive signal processing, Interference cancellation, Intermodulation distortion, Nonlinear circuits
in
IEEE Transactions on Circuits and Systems - II - Express Briefs
volume
63
issue
1
pages
5 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000367258800015
  • scopus:84962205722
ISSN
1558-3791
DOI
10.1109/TCSII.2015.2504272
language
English
LU publication?
yes
id
f7ca0b18-9035-4d3e-844a-0a0f81815db9 (old id 8232797)
date added to LUP
2015-11-30 11:34:48
date last changed
2017-03-26 03:00:27
@article{f7ca0b18-9035-4d3e-844a-0a0f81815db9,
  abstract     = {<p>This brief presents a low-complexity system for digitally assisting a channel select filter (CSF) to mitigate both even- and odd-order nonlinearities. The proposed solution is scalable and can be utilized for nonlinearity mitigation in different analog transceiver blocks. The system consists of an auxiliary path with a low-resolution analog to digital converter (ADC) enabling digital recreation and measurement of the distortion in the main path and relies on an adaptive digital signal processing algorithm to detect and tune the analog components to their optimal settings. The system provides robustness against process, voltage, and temperature variations, and the digital part requires an equivalent logic of only 42 k gates in CMOS technology, enabling cost-efficient implementation on integrated circuits. The operation of the system has been verified by using a tunable CSF capable of receiving a 10-MHz baseband signal interfaced to an external ADC. The results demonstrate that the proposed system is capable of tuning the CSF to its optimal bias voltage, providing a third-order intermodulation reduction of 14.5 dB.</p>},
  articleno    = {7339448},
  author       = {Gangarajaiah, Rakesh and Abdulaziz, Mohammed and Sjöland, Henrik and Nilsson, Peter and Liu, Liang},
  issn         = {1558-3791},
  keyword      = {Adaptive signal processing,Interference cancellation,Intermodulation distortion,Nonlinear circuits},
  language     = {eng},
  number       = {1},
  pages        = {69--73},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Circuits and Systems - II - Express Briefs},
  title        = {A Digitally Assisted Non-Linearity Mitigation System for Tunable Channel Select Filters},
  url          = {http://dx.doi.org/10.1109/TCSII.2015.2504272},
  volume       = {63},
  year         = {2016},
}