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Draw and explain opamp inverting comparator. Draw input and output waveforms for $V_{ref} > 0$ and also for $V_{ref} < 0$.

Mumbai University > Computer Engineering > Sem 3 > Electronic Circuits and Communication Fundamentals

Marks: 10 Marks

Year: May 2015

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1.An op-amp inverting comparator circuit is shown in the figure below.

2.It is called a inverting comparator circuit as the sinusoidal input signal $V_{in}$ is applied to the inverting terminal.

3.The fixed reference voltage $V_{ref}$ is give to the non-inverting terminal (+) of the op-amp.

4.A potentiometer is used as a voltage divider circuit to obtain the reference voltage in the non-inverting input terminal. Bothe ends of the POT are connected to the dc supply voltage $+V_{CC}$ and $-V_{EE}$.

The wiper is connected to the non-inverting input terminal.

6.When the wiper is rotated to a value near $+V_{CC}, +V_{ref}$ becomes more positive, and when the wiper is rotated towards $-V_{EE}$, the value of Vref becomes more negative.

7.The waveforms are shown below.