Operational amplifier applications. Summing amplifier.
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Transcript of Operational amplifier applications. Summing amplifier.
Operational amplifier
applications
Summing amplifier
Instrumentation amplifier
Integrating amplifier
Some sensors output a current rather than a voltage. The most common sensor of this type is the photodiode which has a current output proportional to the amount of light shining on it. The purpose of the signal conditioning circuitry is to convert the current output of the sensor to a voltage.
Photocell Connected to a Current Amplifier
Differentiating amplifier
OPAMP in Non-linear configurations
Precision rectifierAlthough there are some limitations, this super diode circuit behaves like an ideal diode for the load RL
OPAMP in Non-linear configurations
Precision rectifier (Improved Circuit) transfer characteristic
Peak detector
With little modifications basic precision rectifier can be used also for detecting peak levels of signal. In the following circuit a capacitor keeps the peak voltage level of signal and switch can be used for resetting detected level.
Logarithmic output
OPAMP in Non-linear configurations
Exponential configuration
OPAMP in Non-linear configurations
The effect of using a Schmitt trigger (B) instead of a comparator (A).
B
A
Schmitt trigger
Link to Simulation
Schmitt trigger with inverting hysteretic switching characteristic
switching thresholds are:
1Link to Simulation
2
A practical Schmitt trigger configuration
Use as an oscillator
1 2