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
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
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.
Reference
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