Novel FFT LSI for orthogonal frequency division multiplexing using current mode circuit

S. K. Kim, J. S. Cha, H. Nakase, K. Tsubouchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We propose a design method of fast Fourier transform (FFT) large-scaled integration (LSI) for an orthogonal frequency division multiplexing (OFDM) system. The proposed FFT LSI is designed with simple current mode circuits, wired-OR connection and gate-width-ratioed current mirror. For a low power consumption, two design methods are proposed, current-cut (CC) and rounding process. The CC operation is performed with on-off operation of a current source. The rounding process is adopted for the component of the FFT matrix. Bit error rate (BER) in the OFDM system is simulated from "0.1" rounding step to "1.0". The BER performance of the FFT matrix with the "0.2" rounding step has little degradation from that of the original FFT matrix. The 8-point FFT LSI with the "0.2" rounding step is designed and implemented using a 0.8 μtm complementary metal-oxide semiconductor (CMOS) technology. On the basis of measurement of the 8-point FFT LSI, the power consumption of the 64 -point FFT LSI using CC can be estimated as being less than 10 mW.

Original languageEnglish
Pages (from-to)2859-2865
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number4 B
Publication statusPublished - 2001 Apr


  • Current mode circuit
  • Current-cut
  • FFT matrix
  • OFDM system
  • Rounding process
  • Switched-current

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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