A Single-Chip RF Tuner/OFDM Demodulator for Mobile Digital TV Application

Yoshimitsu TAKAMATSU  Ryuichi FUJIMOTO  Tsuyoshi SEKINE  Takaya YASUDA  Mitsumasa NAKAMURA  Takuya HIRAKAWA  Masato ISHII  Motohiko HAYASHI  Hiroya ITO  Yoko WADA  Teruo IMAYAMA  Tatsuro OOMOTO  Yosuke OGASAWARA  Masaki NISHIKAWA  Yoshihiro YOSHIDA  Kenji YOSHIOKA  Shigehito SAIGUSA  Hiroshi YOSHIDA  Nobuyuki ITOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.4   pp.557-566
Publication Date: 2011/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.557
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
digital TV,  1-segment broadcasting,  ISDB-T,  tunable,  low-noise amplifier,  spurious signal,  prescaler,  PLL,  

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Summary: 
This paper presents a single-chip RF tuner/OFDM demodulator for a mobile digital TV application called “1-segment broadcasting.” To achieve required performances for the single-chip receiver, a tunable technique for a low-noise amplifier (LNA) and spurious suppression techniques are proposed in this paper. Firstly, to receive all channels from 470 MHz to 770 MHz and to relax distortion characteristics of following circuit blocks such as an RF variable-gain amplifier and a mixer, a tunable technique for the LNA is proposed. Then, to improve the sensitivity, spurious signal suppression techniques are also proposed. The single-chip receiver using the proposed techniques is fabricated in 90 nm CMOS technology and total die size is 3.26 mm 3.26 mm. Using the tunable LNA and suppressing undesired spurious signals, the sensitivities of less than -98.6 dBm are achieved for all the channels.