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

Abstract

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 470MHz to 770MHz 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 90nm CMOS technology and total die size is 3.26mm × 3.26mm. Using the tunable LNA and suppressing undesired spurious signals, the sensitivities of less than -98.6dBm are achieved for all the channels.