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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(2):554-556; doi:10.1093/ietfec/e91-a.2.554
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Analog Circuit Techniques and Related Topics -- Letters

A Polyphase Transfer Function Design Based on Frequency Transformation from Prototype LPF

Cosy MUTO1

1 The author is with the Center for Human Quality of Life through IT, Kyushu Institute of Technology, Kitakyushu-shi, 808-0196 Japan. E-mail: muto{at}lsse.kyutech.ac.jp


  Abstract

In this paper, a frequency transformation for designing polyphase transfer functions is proposed. A modification to the bilinear LP-LP transformation, which assigns both stopband edges on negative frequency range whereas passband edges are on positive one, results polyphase transfer functions. Design examples show validity of the proposed method.

Key Words: polyphase filter, complex filter, frequency transformation, Zolotarev approximation

Manuscript received June 11, 2007. Manuscript revised August 27, 2007.


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