New current attenuator circuit in the current mode FFT LSI for OFDM

Author

Kim, S.-K. ; Saigusa, S. ; Kameda, S. ; Nakase, H. ; Tsubouchi, K.

Author_Institution

Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan

Volume

1

fYear

2002

fDate

2002

Firstpage

225

Abstract

To achieve the high performance of current-mode fast-Fourier-transform (FFT) large-scaled integration (LSI) for orthogonal frequency division multiplexing (OFDM) system, a new current-attenuator circuit without a DC offset-current error is proposed. The attainable maximum scale accuracy to the input current is theoretically -80 dB in the proposed attenuator circuit. The circuit consists of N-current mirrors simply connected in parallel with one another. The output current of the circuit is reduced to 1/N of the input current. The proposed circuit exerts high accuracy on the current attenuation and enables us to design the current-mode 64-point FFT LSI for OFDM system.

Keywords

CMOS integrated circuits; OFDM modulation; attenuators; current mirrors; current-mode circuits; fast Fourier transforms; integrated circuit design; integrated circuit modelling; large scale integration; CMOS current mode FFT LSI current attenuator circuits; DC offset-current error; OFDM applications; circuit input/output currents; current-mode fast-Fourier-transform large-scaled integration; input current maximum scale attenuation accuracy; orthogonal frequency division multiplexing systems; parallel connected current mirrors; Attenuators; Current mode circuits; Digital signal processing; Discrete Fourier transforms; Energy consumption; Large scale integration; Mirrors; OFDM; Wireless LAN; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. APCCAS '02. 2002 Asia-Pacific Conference on

Print_ISBN

0-7803-7690-0

Type

conf

DOI

10.1109/APCCAS.2002.1114942

Filename

1114942