Differential Amplifier Calculator

A differential amplifier is one of the most important electronic circuits used in modern systems. It helps amplify the difference between two input signals while rejecting unwanted noise. This is why differential amplifiers are widely used in sensors, audio systems, medical devices, and communication equipment.

To make this calculation simple and fast, we have developed a free online Differential Amplifier Calculator. This tool helps users calculate differential voltage, common mode voltage, output voltage, gain, and CMRR without doing manual math. Our calculator is designed for students, engineers, and electronics learners who want quick and accurate results.

With this tool, you can easily understand how a differential amplifier works and get correct values in seconds.

What Is a Differential Amplifier

A differential amplifier is an electronic circuit that amplifies the difference between two input voltages and ignores common noise signals.

It takes two inputs:

V1 and V2

Then it finds their difference and amplifies it using a gain factor.

The main purpose of a differential amplifier is to remove unwanted signals and amplify only useful information. This makes it ideal for precision applications.

Why Use a Differential Amplifier Calculator

Manual calculation of differential amplifier values can be time-consuming and confusing. Many users also make mistakes in formulas or unit conversion.

Our online differential amplifier calculator helps you:

• Calculate results instantly
• Avoid calculation errors
• Save time
• Understand circuit behavior
• Improve learning accuracy

This tool is especially useful for electronics students, teachers, hobbyists, and professionals.

Differential Amplifier Formula

Our calculator uses standard electronics formulas that are used worldwide.

Differential Voltage Formula

Vd = V1 − V2

This formula calculates the difference between two input voltages.

Common Mode Voltage Formula

Vc = (V1 + V2) / 2

This formula finds the average of both input signals.

Output Voltage Formula

Vout = Ad × Vd + Ac × Vc

Where:

• Vout = Output voltage
• Ad = Differential gain
• Ac = Common mode gain
• Vd = Differential voltage
• Vc = Common mode voltage

This formula represents the practical differential amplifier model.

Differential Gain in dB Formula

Ad(dB) = 20 log10(Ad)

This converts gain into decibel form.

Common Mode Rejection Ratio Formula

CMRR = Ad / Ac

CMRR(dB) = 20 log10(Ad / Ac)

Higher CMRR means better noise rejection.

How to Calculate Differential Amplifier Manually

To calculate a differential amplifier manually, follow these steps.

1. First, subtract V2 from V1 to find Vd.
2. Second, add V1 and V2 and divide by 2 to find Vc.
3. Third, multiply Vd by Ad.
4. Fourth, multiply Vc by Ac.
5. Finally, add both values to get Vout.

This process requires attention and accuracy. One small mistake can give wrong results. That is why using an online calculator is recommended.

How to Use Online Differential Amplifier Calculator

Our differential amplifier calculator is very easy to use.

1. Enter the first input voltage V1.
2. Enter the second input voltage V2.
3. Select the correct unit for both voltages.
4. Enter the differential gain Ad.
5. Enter the common mode gain Ac.
6. Click on the Calculate button.
7. View your results instantly.

After clicking calculate, the tool will show differential voltage, common mode voltage, output voltage, gain in dB, and CMRR values.

No technical knowledge is required to use this calculator.

Example Differential Amplifier Calculation

Let us understand this with a simple example.

Given:

• V1 = 4 V
• V2 = 2 V
• Ad = 80
• Ac = 0.02

Step 1: Calculate Vd

Vd = 4 − 2 = 2 V

Step 2: Calculate Vc

Vc = (4 + 2) / 2 = 3 V

Step 3: Calculate Vout

Vout = 80 × 2 + 0.02 × 3

Vout = 160 + 0.06

Vout = 160.06 V

Step 4: Calculate CMRR

CMRR = 80 / 0.02 = 4000

Step 5: Calculate CMRR in dB

CMRR(dB) = 20 log10(4000) ≈ 72.04 dB

So, the output voltage is 160.06 V and the CMRR is 72.04 dB.

Applications of Differential Amplifier

Differential amplifiers are widely used in many electronic systems.

They are used in operational amplifiers, sensor circuits, audio amplifiers, biomedical instruments, data acquisition systems, and communication devices.

Because of their noise rejection ability, they are essential in precision electronics.

Final Verdict

The Differential Amplifier Calculator is a powerful and easy tool for calculating differential amplifier parameters. It helps users avoid complex formulas and manual calculations.

Whether you are a student learning electronics or an engineer working on circuit design, this calculator will save your time and improve accuracy.

With simple inputs and instant results, our tool makes differential amplifier calculation fast, reliable, and stress-free.

Try our calculator today and experience smart electronics calculation.

FAQs

What is a differential amplifier calculator?

A differential amplifier calculator is an online tool that calculates voltage, gain, and CMRR values of a differential amplifier automatically.

Is this calculator free to use?

Yes, our differential amplifier calculator is 100% free and accessible online.

Can beginners use this calculator?

Yes, this tool is designed for beginners and professionals. No advanced knowledge is required.

Does this calculator support unit conversion?

Yes, it allows you to select voltage units such as mV, V, and kV.

Is this calculator accurate?

Yes, it uses standard electronics formulas to provide accurate and reliable results.