Remotely_powered_sensor_amp

Published:2009/7/19 22:41:00 Author:Jessie | From:SeekIC

A simple two-wire current transmitter uses no power at the transmit-ting end (except that from the transmitted signal). At the transmitter, a 0- to 1-V input drives a MAX406 and npn transistor that is connected as a voltage-controlled current source. Although the MAX406 supply current is taken from the signal, only 1-μA out of 2-mA error is added. The output is sent through the coax to the MAX480, which reconstructs a ground-referenced 0- to 1-V signal. Maxim 1992, Applications and Product Highlights p. 5-9



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