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Analysis of a high frequency and wide bandwidth active polyphase filter based on CMOS inverters

Wernehag, Johan LU and Sjöland, Henrik LU (2009) In Analog Integrated Circuits and Signal Processing 59(3). p.243-255
Abstract
An active polyphase filter capable of high frequency quadrature signal generation has been analyzed. The resistors of the classical passive polyphase filter have been replaced by transconductors, CMOS inverters [1,2]. A three-stage 0.13 um CMOS active polyphase filter has been designed. Simulations with a differential input signal show a quadrature error less than 1◦ for the full stable input voltage range for frequencies from 6 GHz to 14 GHz. Phase errors in the differential input signal are suppressed at least 3 times at the output. Corner simulations at 10 GHz show a maximum phase error of 3◦ with both n- and pMOS slow, in all other cases the error is less than 0.75◦. The three-stage filter consumes 34 mA from a 1.2 V supply. To... (More)
An active polyphase filter capable of high frequency quadrature signal generation has been analyzed. The resistors of the classical passive polyphase filter have been replaced by transconductors, CMOS inverters [1,2]. A three-stage 0.13 um CMOS active polyphase filter has been designed. Simulations with a differential input signal show a quadrature error less than 1◦ for the full stable input voltage range for frequencies from 6 GHz to 14 GHz. Phase errors in the differential input signal are suppressed at least 3 times at the output. Corner simulations at 10 GHz show a maximum phase error of 3◦ with both n- and pMOS slow, in all other cases the error is less than 0.75◦. The three-stage filter consumes 34 mA from a 1.2 V supply. To investigate the robustness of the filter to changes in inverter delay, an inverter model was implemented in Verilog-A. Linear cin and gin were used, whereas gm, cout, and gout were non-linear. It was found that the filter could tolerate substantial delays. Up to 40◦ phase shift resulted in less than 1.5◦ quadrature phase error at the output. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
RF, Active polyphase filter, Quadrature generation, CMOS
in
Analog Integrated Circuits and Signal Processing
volume
59
issue
3
pages
243 - 255
publisher
Springer
external identifiers
  • wos:000264618400002
  • scopus:67650922396
ISSN
0925-1030
DOI
10.1007/s10470-008-9261-y
language
English
LU publication?
yes
id
2181817b-be37-4ebe-a08e-e7b142e89c7f (old id 1366845)
date added to LUP
2009-03-31 11:08:46
date last changed
2017-01-01 06:20:23
@article{2181817b-be37-4ebe-a08e-e7b142e89c7f,
  abstract     = {An active polyphase filter capable of high frequency quadrature signal generation has been analyzed. The resistors of the classical passive polyphase filter have been replaced by transconductors, CMOS inverters [1,2]. A three-stage 0.13 um CMOS active polyphase filter has been designed. Simulations with a differential input signal show a quadrature error less than 1◦ for the full stable input voltage range for frequencies from 6 GHz to 14 GHz. Phase errors in the differential input signal are suppressed at least 3 times at the output. Corner simulations at 10 GHz show a maximum phase error of 3◦ with both n- and pMOS slow, in all other cases the error is less than 0.75◦. The three-stage filter consumes 34 mA from a 1.2 V supply. To investigate the robustness of the filter to changes in inverter delay, an inverter model was implemented in Verilog-A. Linear cin and gin were used, whereas gm, cout, and gout were non-linear. It was found that the filter could tolerate substantial delays. Up to 40◦ phase shift resulted in less than 1.5◦ quadrature phase error at the output.},
  author       = {Wernehag, Johan and Sjöland, Henrik},
  issn         = {0925-1030},
  keyword      = {RF,Active polyphase filter,Quadrature generation,CMOS},
  language     = {eng},
  number       = {3},
  pages        = {243--255},
  publisher    = {Springer},
  series       = {Analog Integrated Circuits and Signal Processing},
  title        = {Analysis of a high frequency and wide bandwidth active polyphase filter based on CMOS inverters},
  url          = {http://dx.doi.org/10.1007/s10470-008-9261-y},
  volume       = {59},
  year         = {2009},
}