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A polyphase filter based on CMOS inverters

Publiceringsår: 2007
Språk: Engelska
Sidor: 7-12
Publikation/Tidskrift/Serie: Analog Integrated Circuits and Signal Processing
Volym: 50
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: Springer


A new idea for generation of quadrature signals on chip is presented. The topology is based on a passive RC polyphase filter, where the resistive parts are made active by using inverters. The active filter combines quadrature generation, isolation, and gain without losing quadrature performance compared to a regular RC polyphase filter. The filter technique is demonstrated in a 10 GHz front-end application where a broadband VCO, having a tuning range of 1.44 GHz, drives an active polyphase filter to generate quadrature LO signals. According to simulations the quadrature phase error shows a typical tuned behavior and stays below 0.8 degrees for the complete tuning range. Since the signal amplitude is high throughout the filter the noise is low, below 160 dBc/Hz at 10 MHz offset. The high amplitude also reduces the need for high gain tuned buffers, thereby enabling significant reductions in chip area.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • quadrature generation
  • CMOS
  • polyphase filter


  • ISSN: 0925-1030

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