| 摘要 |
PROBLEM TO BE SOLVED: To provide a demodulator circuit which has a simple circuit constitution that includes no analog elements nor feedback elements in an asynchronous communication mode. SOLUTION: A synchronous pulse generation part 46 generates a synchronous pulse from a preamble signal, and a counter COUNT1 starts its operation by the synchronous pulse and outputs a count output signal. Then the count output signal is delayed by a D flip-flop DFF2 for generating a demodulating clock that has its cycle almost equal to that of the preamble signal of a received signal and also has its phase that is shifted from the preamble signal by 90 degrees. The received signal is demodulated by means of the demodulating clock. |
