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Operational Amplifiers
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High-pass Filter
A device that allows signals with a frequency higher than the selected cutoff frequency to pass and attenuates frequencies lower than the cutoff frequency.
Differential Amplifier
An amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs.
Integrator
An amplifier that performs integration of the input signal with respect to time, outputting the time integral of the input voltage.
Non-Inverting Amplifier
An amplifier that maintains the phase of the input signal. The gain is one plus the ratio of two resistors connected in the feedback loop.
Summing Amplifier
A configuration that can add several input voltages together, weighted by the resistances in the circuit.
Voltage Follower (Buffer)
A configuration that provides no gain (unity gain) but offers high input impedance and low output impedance.
Differentiator
An amplifier that produces an output that is proportional to the rate of change (derivative) of the input signal.
Inverting Amplifier
An amplifier that produces an output that is 180 degrees out of phase with the input. The gain is determined by the ratio of two resistors.
Comparator
A configuration that compares two voltages and switches the output to indicate which voltage is higher.
Low-pass Filter
A device that allows signals with a frequency lower than the selected cutoff frequency to pass and attenuates frequencies higher than the cutoff frequency.
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