How is Vo related to Vin and VREF?

For Vref = 0 , the voltage transfer characteristic Vo versus Vin is as shown on Figure 2. When Vin > vδ + , Vo = VDD and for Vin < vδ − , Vo = VEE . The values vδ + and vδ − is inversely proportional to the open-loop gain A.

What is inverting and non-inverting input in op-amp?

An Operational Amplifier is basically a three-terminal device which consists of two high impedance inputs. One of the inputs is called the Inverting Input, marked with a negative or “minus” sign, ( – ). The other input is called the Non-inverting Input, marked with a positive or “plus” sign ( + ).

When to use an op amp in a comparator circuit?

If the inverting terminal’s voltage is higher than the voltage in the non-inverting terminal, the output is switched to the op-amp’s negative saturation voltage. Op-amp 741 is an integrated circuit containing an op amp. A voltage comparator can be created using op amp 741.

What can an inverting op amp be used for?

It is also used in active filters, analog comparators, and as buffers between two stages of a circuit. The op-amp can be configured as a non-inverting amplifier or as an inverting amplifier. The circuits for these two amplifier configuration is shown below: The gain of the inverting op-amp can be calculated using the formula:

Which is the non inverting comparator in open loop?

Figure below shows the Non-Inverting Comparator. The op-amp is in open loop configuration and hence its output is in saturation. The saturation level at the output may be positive or negative depending on the input signal. Here op-amp acts as a comparator and compares the input signal with the reference voltage.

When to use a positive or negative comparator in an amplifier?

Positive and Negative Voltage Comparators A basic op-amp comparator circuit can be used to detect either a positive or a negative going input voltage depending upon which input of the operational amplifier we connect the fixed reference voltage source and the input voltage too.