| 摘要 |
PURPOSE: To provide an FM demodulation circuit that discriminates a high(H) or low(L) level of data demodulated by a simple configuration means so as to obtain the demodulation data with high discrimination accuracy. CONSTITUTION: The FM demodulation circuit provided with a frequency discrimination section 1 that applies FM demodulation to a received high frequency signal of the Bluetooth mode transmission system to reproduce data and a level discrimination section 2 and the frequency discrimination section 1 that outputs data applying digital conversion to a frequency discrimination output of the high frequency signal, and the level discrimination section 2 compares a level of current input data supplied from the frequency discrimination section 1 for a newest clock period with just precedingly received data supplied from the frequency discrimination section 1 for a clock period before one clock, discriminates a logic state of the current input data on the basis of the result of level comparison and reproduces the data according to the discriminated logic state.
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