Weak signal amplifier circuit diagram composed of magnetosensitive resistance

Published:2011/5/16 3:12:00 Author:Nicole | Keyword: weak signal, amplifier, magnetosensitive resistance | From:SeekIC

The figure 1 is a weak signal amplifier circuit which is composed of magnetosensitive resistance. About the paper currency recognizing device which is composed of RM1 and RM2, its output singal is small just about 0.4mV, so, itshould adopt the amplifier with more than 200 times. The adopted amplifier is shown in the figure1, the key of amplifier design is the temperature drift of reference voltage. Al is DC amplifier, RF is feedback resistance. It also is the AC amplifier of capacity coupling, the time constant selects low frequency signal approved resistance and capacity value. This circuit can not amplify the quiescent singal, but it can amplify the singal which is detected by the slow moving magnetosensitive resistance.



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