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Solutions Search - LTC6079 - Micropower Precision, Quad CMOS Rail-to-Rail Input/Output Amplifiers

Six Decade Current Sensing Log Amplifier

Aug 16th 2005
The low pA's of bias current of CMOS amplifiers make them suitable for high input impedance current sensing applications. By taking advantage of the logarithmic relationship of a transistor base-emitter voltage to it's collector current a very wide range of measured input current can be converted to a voltage. In this circuit ...

Circuit 

 

Relative Humidity Sensor

Mar 2nd 1999
This sensor is a capacitive element that changes value with humidity. By charging the sensor with a fixed current for a fixed time interval, a voltage is developed that is directly proportional to the sensor capacitance value. ...

Circuit