| 摘要 |
<p>PURPOSE:To output I component waveform and Q component waveform by selecting a read only memory fetching each output data in 1st and 2nd shift registers in time division and outputting each fetched data in time division. CONSTITUTION:The I component data 1 is converted into a parallel data by a shift register 3a and the Q component data 2 is converted into a parallel data by a shift register 3b, the data is multiplexed in time division by a multiplex circuit 4 according to a time division control signal from a time division control circuit 9 and inputted to an address input terminal of a ROM 7. Simultaneously, a sampling clock 5 is counted by a count 6 and inputted to an address input terminal of the ROM 7. Thus, the waveform data outputted from the ROM 7 is shared into the I component waveform data and the Q component waveform data by a selection circuit 8 synchronously with the multiplication operation of a multiplication circuit 4 by a time division control signal from the time division control circuit 9. Thus, the data is converted and outputted as the I component waveform 11 and the Q component waveform 12 by D/A converters 10a, 10b.</p> |
