Dear all hands
Some time when we want to measure a signal we must amplify it before we can measure it. To amplify signal we can use sensor amplifier. Sensor amplifier can easily constructed from op-amp or we can use certain linear amplifier IC devices.
Practical sensor amplifier topology is divided in two category , that is:
- Single ended practical sensor amplifier
- Differential practical sensor amplifier
- Isolated practical sensor amplifier
Figure below show single ended practical sensor circuit with op-amp :
Basically single ended practical sensor amplifier above is inverting amplifier. Its called single ended practical sensor amplifier because in this practical sensor amplifier its input mode is not in differential mode (output from sensor its referenced to ground not with another signal).
Main drawback of this practical sensor amplifier is that it hasn’t very high input impedance. Gain of this sensor amplifier circuit is : -(R2/R1).
But if we need single ended practical sensor amplifier with very high input impedance we can use another single ended practical sensor amplifier as depicted below :
High impedance single ended practical sensor amplifier circuit above basically is a non inverting amplifier, its has very high input impedance and its gain is : 1-(R2/R1)
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