Out of Common Source (CS), Common Drain (CD) and Common Gate (CG) amplifier, which have highest bandwidth?
Question
Out of Common Source (CS), Common Drain (CD) and Common Gate (CG) amplifier, which have highest bandwidth?
Solution
The Common Gate (CG) amplifier has the highest bandwidth among the Common Source (CS), Common Drain (CD), and Common Gate (CG) amplifiers.
Here's why:
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The Common Gate (CG) amplifier configuration is similar to the Common Base (CB) configuration of a bipolar junction transistor. This configuration is known for its wide bandwidth.
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The CG configuration has a low input impedance and high output impedance. This allows it to transfer high-frequency signals effectively, resulting in a higher bandwidth.
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The CG amplifier has a unity current gain, which means it can handle high-frequency signals better than the CS and CD configurations.
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The CS and CD amplifiers have a phase shift in the output, which can limit the bandwidth. The CG amplifier, on the other hand, does not have this limitation.
Therefore, the Common Gate (CG) amplifier has the highest bandwidth among the three configurations.
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