Enter the input/source voltage (volts) and the amplifier gain into the calculator to determine the Amplifier Voltage. 

Amplifier Voltage Formula

The following formula is used to calculate the Amplifier Voltage. 

Va = Vi * G
  • Where Va is the Amplifier Voltage (volts)
  • Vi is the input/source voltage (volts) 
  • G is the amplifier gain 

To calculate the amplifier voltage, multiply the input voltage by the amplifier gain.

How to Calculate Amplifier Voltage?

The following two example problems outline how to calculate the Amplifier Voltage.

Example Problem #1:

  1. First, determine the input/source voltage (volts). In this example, the input/source voltage (volts) is measured to be 45.
  2. Next, determine the amplifier gain. For this problem, the amplifier gain is calculated to be 4.
  3. Finally, calculate the Amplifier Voltage using the formula above: 

Va = Vi * G

Inserting the values from above and solving the equation with the imputed values gives: 

Va = 45 * 4 = 180 (volts)

FAQ

What is amplifier gain and how does it affect amplifier voltage?

Amplifier gain is a measure of how much an amplifier increases the strength of an input signal. It is typically expressed as a ratio or in decibels (dB). The higher the gain, the more the amplifier increases the voltage of the input signal, resulting in a higher amplifier voltage (Va). The relationship between input voltage (Vi), amplifier gain (G), and amplifier voltage is given by the formula Va = Vi * G.

Can amplifier voltage be higher than the input/source voltage?

Yes, the amplifier voltage can be higher than the input/source voltage if the amplifier gain is greater than 1. The purpose of an amplifier is to increase the voltage, current, or power of an input signal, and this is achieved by setting the gain to a value that amplifies the input signal to the desired level.

Is there a limit to how much an amplifier can increase the voltage of an input signal?

Yes, there are practical limits to how much an amplifier can increase the voltage of an input signal. These limits are determined by the amplifier’s design, the power supply voltage, and the components used in the amplifier. Exceeding these limits can result in distortion of the output signal or damage to the amplifier. It’s important to select an amplifier that can provide the desired gain without exceeding its operational limits.