Bidirectional communication line. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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The ability of the op-amp to suppress common-mode (coming simultaneously to both inputs) voltage allows you to select a weak useful signal against the background of strong interference. The figure shows a diagram of a device (its principle of operation is based on the specified property of the op-amp), which allows transmitting signals in both directions over a single coaxial cable (elements on the right side of the diagram are assigned reference designations starting with number 11).
Input signals A and B through buffer amplifiers (DA1, DA11) with a gain of 1 and resistors R5, R15 enter the line. The inputs of the op-amp UA2 and DA 12 are also connected to it, amplifying the difference signal, and the common mode signal is suppressing. By changing the resistances of the tuning resistors R8 and R18, it is possible to achieve suppression of an unwanted signal by 50 ... 55 dB.
The device can be used to transmit not only analog but also digital signals.
Note. Domestic analogue of OU 741 K140UD7.
Literature
- Obousmerne nf vedeni. Sdelovaci technika". 1986, N 4. p. 147
- Radio 2, 1987, p.59
Publication: cxem.net
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