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

Publiceringsår: 2009
Språk: Engelska
Sidor: 243-255
Publikation/Tidskrift/Serie: Analog Integrated Circuits and Signal Processing
Volym: 59
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Springer


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 The resistors of the classical passive polyphase filter have been replaced by transconductors, CMOS inverters [1,2].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.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • RF
  • Active polyphase filter
  • Quadrature generation
  • CMOS


  • Elektronikkonstruktion-lup-obsolete
  • Analog RF-lup-obsolete
  • ISSN: 0925-1030

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