# Can you use op-amp as comparator?

Aug 18, 2020

## Can you use op-amp as comparator?

A comparator has a logic output that indicates which of the two inputs is at a higher potential. However, the best advice on using an op amp as comparator is very simple—don’t! Comparators are designed to work as open-loop systems, to drive logic circuits, and to work at high speed, even when overdriven.

Which multivibrator is used as an amplitude comparator?

Schmitt trigger circuits are used as Amplitude Comparator and Squaring Circuit. They are also used in Pulse conditioning and sharpening circuits. These are the Multivibrator circuits using transistors.

### How do amplifiers act as a comparator?

At the output, ordinary op amps use push-pull output circuitry for essentially symmetrical swings between the specified power supply voltages, while comparators usually have an “open-collector” output with grounded emitter. This feature allows the comparator to interface with a variety of logic families.

What do you mean by monostable multivibrator explain it working with diagram using op-amp?

Op-amp Monostable Multivibrators are electronic circuits which produces a single timed rectangular output pulse when externally triggered. Monostable circuits can easily be made using discrete components or digital logic gates but monostable circuits can also be constructed using operational amplifiers.

#### What is the purpose of a comparator in op amps?

A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side; VDD in the illustration) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.

Why is it called bistable multivibrator?

Bistable Multivibrators have TWO stable states (hence the name: “Bi” meaning two) and maintain a given output state indefinitely unless an external trigger is applied forcing it to change state.

## What is another name for bistable multivibrator?

In other words a multivibrator which has both the state stable is called a bistable multivibrator. It is also called flip-flop, trigger circuit or binary. The output pulse is obtained when, and why a driving (triggering) pulse is applied to the input.

What is multivibrator and types?

A multivibrator is an electronic circuit used to implement a variety of simple two-state devices such as relaxation oscillators, timers, and flip-flops. It consists of two amplifying devices (transistors, vacuum tubes, or other devices) cross-coupled by resistors or capacitors.

### What is the function of trigger pin?

The pin functions as both an input and an output. A trigger output pin will generate output triggers from any subsystem that has been configured to output trigger signals. Applies only to pin 8. Connected to ground.

What kind of circuit is the op-amp multivibrator?

The Op-amp Multivibrator is an astable oscillator circuit that generates a rectangular output waveform using an RC timing network connected to the inverting input of the operational amplifier and a voltage divider network connected to the other non-inverting input.

#### Is the op-amp Schmitt comparator a bistable circuit?

The op-amp Schmitt comparator can be seen as a bistable circuit, as it has two stable states, with Vout only being stable at Vs+ or Vs-. The hysteresis is defined by the resistor network but has the opposite effect to the inverting op-amp.

How is a monostable op-amp circuit set up?

Similar to the multivibrator tutorial, the monostable op-amp circuit is based around a Schmitt comparator. To revise how a Schmitt comparator functions, it is set up similarly to an inverting op-amp, but instead of the resistor divider feeding back into the negative input, it is fed back into the positive.

## How many resistors are needed for an op amp comparator circuit?

Consider the voltage level detector circuit below. As above, the voltage divider network provides a set of reference voltages for the individual op-amp comparator circuits. To produce the four reference voltages will require five resistors.