| 摘要 |
PURPOSE:To send an analog signal with linearity, excellent noise immunity and simple and inexpensive circuit constitution by differentiating an analog transmission signal, sending the result via a pulse transformer, amplifying inversely the sent signal and integrating the signal. CONSTITUTION:When a rectangular pulse signal S1 is inputted to an input terminal 10, an output signal of a differentiation circuit 12 is a differentiation signal S2. Since the differentiation signal S2 has no rectangular pulse component, even when the signal is sent via a transmission line 16 having pulse transformers 13, 15, no waveform distortion appears as shown in a signal S3. When the signal S3 (level e3) is inputted to a recovery circuit 18, the recovery signal S4 (level e4) is a rectangular waveform signal being the superimposition of the inversely amplified signal -R3e3/R2 and the integrated signal -1/C2R2integral e3dt. The recovery signal S4 is of opposite polarity to that of the transmission signal S1 and attenuated by the transmission line 6 or the like, then the signal is amplified inversely (-r3/r2) by an inverse amplifier circuit 20 and becomes the same signal as the transmission signal S1 as shown in the signal S5.
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