If the difference between the two signals is negative, op-amp goes into negative saturation i. The above simple operation can be summarized in mathematical conditions as follows. Ac dc power converters single phase full wave controlled rectifier single phase half wave controlled rectifier three phase full wave controlled rectifier three phase half controlled rectifier.
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Fig1 shows a voltage comparator in inverting mode and Fig shows a voltage comparator in non inverting mode. In non inverting comparator the reference voltage is applied to the inverting input and the voltage to be compared is applied to the non inverting input. Actually what happens is that, the difference between Vin and Vref, Vin — Vref will be a positive value and is amplified to infinity by the opamp.
Since there is no feedback resistor Rf, the opamp is in open loop mode and so the voltage gain Av will be close to infinity. When the Vin goes below Vref, the reverse occurs. In the case of an inverting comparator, the reference voltage is applied to the non inverting input and voltage to be compared is applied to the inverting input.
Whenever the input voltage Vin goes above the Vref, the output of the opamp swings to negative saturation. Here the difference between two voltages Vin-Vref is inverted and amplified to infinity by the opamp. Since there is no feedback resistor, the gain will be close to infinity and the output voltage will be as negative as possible ie; V-.
A practical non inverting comparator based on uA opamp is shown below. Here the reference voltage is set using the voltage divider network comprising of R1 and R2. Integrator using opamp : For an integrating circuit, the output signal will be the integral of the input signal.
For example, a sine wave on integration gives cosine wave, square wave on integration gives triangle wave etc. Inverting amplifier : In an inverting amplifier, the output signal will be an inverted version of the input signal and is amplified by a certain factor.
Instrumentation amplifier : This is a type of differential amplifier with additional buffer stages at the input.
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A non-inverting comparator is an op-amp based comparator for which. In this non-inverting configuration, the reference voltage is connected to the inverting input of the operational amplifier with the input signal connected to. Here op-amp acts as a comparator and compares the input signal with the reference voltage. If the difference between the two signals is positive, op-amp goes.