Abstract
In Japan, a new digital broadcasting service using the broadcasting satellite (BS digital) starts in the year 2000. The Japanese BS digital system has one of three different modulation formats (binary phase shift keying (BPSK), quadrature PSK (QPSK), and 8PSK), dynamically selected according to transmission and multiplexing configuration control (TMCC) data transmitted with the audio and video data. The TMCC data also include the inner code (convolutional code) rate. Thus, a demodulator LSI that automatically controls the modulation format and inner code is required for consumer receivers. The poor group-delay characteristic and the inaccurate quadrature down conversion of the analog front-end are critical to demodulator design for low bit-error rate (BER). The authors describe an LSI which employs a flexible carrier-recovery system achieving dynamically configurable multi-format demodulation, and a clock phase compensator and carrier phase shifter cancelling the poor performance of the analog front-end circuit.
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