| 摘要 |
A receive coupler for a binary data communication system that transmits signals in rectangular waveform on a data bus (11) is provided. The receive coupler includes a transition and polarity detector (17) that differentiates received signals and produces an output pulse on one or the other of two output lines (21a and 21b) for each transition of the received signal, the output line being dependent upon the rise-fall direction of the transition. That is, rise transitions create pulses on one output line (21a) and fall transitions create pulses on the other output line (21b). The receive coupler also includes reconstruction logic (19) connected to the output lines of the transition and polarity detector (17) that reconstructs the receive signal based on the pulses. The pulses are created in the transition and polarity detector by two differentiator-comparator combinations. One differentiator-comparator combination differentiates transitions of the rectangular waveform data signals amplified by a receiver amplifier (15) and produces a pulse when rise transition exceeds a threshold level and the other differentiator-comparator combination differentiates transitions of the rectangular waveform data signals amplified by the receiver amplifier (15) and produces a pulse when fall transition exceeds a threshold level. |
