Tuesday, December 02, 2014

Non Inverting Amplifier - Op-Amp Designs

The input impedance of this module is very high, if U1 is OP07 it is in mega/giga ohms, use CA3140 or LF356 fet input opamps to get 1 tera ohm input impedance, but for high gains OP07 is better as it is ultra low offset. This is a good amplifier for sensor outputs, as it is a DC Circuit.

Non Inverting Amplifier - Op-Amp Designs

Non Inverting Amplifier - Op-Amp Designs

The zener diodes protect the opamp inputs, R1 limits current during high voltage inputs and R1 and C1 form a filter to remove some ac components, C1 should be a plastic type as ceramic and electrolytic caps are leaky. A large C1 will slow the response time, the sum of Ri + Rf should be greater than 5k so that output is not loaded. Do not connect output to voltages more than vcc/vdd, it will blow Opamp.

Non-Inverting Op-Amp Tutorial xml code