Differences between Current Amplifiers and Voltage Amplifiers

current amplifier
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Current Amplifier Vs. Voltage Amplifier: Differences between Current Amplifiers and Voltage Amplifiers

A Voltage amplifier

The operation of an electronic system necessitates some form of amplification. That is why we discover amplifiers in every one of them. Given the numerous varieties of amplitudes offered, the following are the ones found in the majority of devices:

  • voltage amplifier, and
  • current amplifier

Of course, you may readily notice the difference by comparing their signal types. Still, there are various alternative techniques to accomplish the goal. So, without further ado, let’s look at the differences between these two!

Differences between Current and Voltage Amplifiers

Current Amplifier Vs. Voltage Amplifier: Material

Although they are both amplitudes, which means they increase the amplitude of the input signal, they are made from different materials to produce efficient output.

Voltage amplitudes are often constructed from voltage control semi-conductor devices such as Field Effect Transistors (FET). On the other hand, current amplifiers are generally made with current-controlled semi-conductor devices like Bipolar Junction Transistors (BJT).

Current Amplifier Vs. Voltage Amplifier: Impedance

When opposed to current amplifiers, voltage amplifiers produce higher impedance. As a result, the circuit’s current circulation is reduced.

High currents were circulated when the current amplifiers generated lesser impedance. The current gain will be significant, while the voltage gain will be minor.

Current Amplifier Vs. Voltage Amplifier: Power

When opposed to current amplifiers, voltage amplifiers have a more significant output impedance. As a result, the circuit’s current circulation is restricted.

High currents are circulated when the current amplifiers produce lesser impedance. It suggests that there will be a lot of currency gains and only a little voltage gain.

Current Amplifier Vs. Voltage Amplifier: Application

Current amplifiers are excellent at signal processing, pre-amplification, and enhancing the transducer’s power. On the other hand, voltage amplitudes perform better for audio signal amplification and loudspeaker operation.

Current Amplifier Vs. Voltage Amplifier: Input and Output

For current amplifiers, both input and output voltage remains almost constant. Likewise, for voltage amplitudes, both input and output current remains constant.

Current Amplifier Vs. Voltage Amplifier: Sensitivity

Sensitivity also plays a critical role in differentiating these two kinds of amplitudes. Current amplifiers are more well-known for their high sensitivity to variations in input current.

The situation is similar to that of voltage amplitudes, except they are more sensitive to fluctuations in the input voltage.

Current Amplifier Vs. Voltage Amplifier: Capacitance

Because voltage amplitudes have a large impedance, they acquire a capacitance effect, also known as the miller effect. On the other hand, using current amplitudes is not possible because they produce lower impedance.

Current Amplifier Vs. Voltage Amplifier: Leakage

Because of the capacitance effect in voltage amplitudes, current leakage is very noticeable. Because there is no capacitance impact in the current amplifier, current leakage appears to be minimal.

Current Amplifier Vs. Voltage Amplifier: Frequency

Voltage amplitudes require a high-frequency signal to operate. As a result, the device produces unwanted noise and signals, which is quite unpleasant. However, in the case of current amplitudes, the situation is the polar opposite.


We have endeavored to highlight every feature that distinguishes current amplifiers from voltage amplifiers in this text. As a result, rather than hunting for signal kinds, try attempting to separate them using the differences mentioned above. Exploring solutions with this diverse set of tools will undoubtedly be fun!

You can also read: Benefits of Using an Operational Amplifier

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