Transmission line interface circuit

Details Transmission line interface circuit Transmission line interface circuit

1975-10-20

1977-01-04

Mullins, James B.

Amplifiers

With diverse-type art device

With process control system

330 28, 330105, H03F 134

Patent

active

040017036

ABSTRACT:
An interface circuit for a transmission line between a remote transmitter and a central control room instrument includes an operational amplifier. The input of the operational amplifier is derived from the current drawn by the remote transmitter. The output signal of the operational amplifier is applied to control the operation of a transistor current controlling amplifier. The current controlled by the transistor amplifier is drawn from the same source as the current drawn by the transmitter. Because of a feedback connection from the transistor amplifier to the input of the operational amplifier, the output current from the transistor amplifier is a mirror image of current drawn by the transmitter. With that arrangement, both the power supply and the remote transmitter may be grounded without loss of accuracy or reliability.

REFERENCES:
patent: 3696304 (1972-10-01), Fricke
Trietley, "Voltage-to-Current Converter for Process-Control Systems," Electronics, Apr. 26, 1973, p. 102.

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