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Difference between cascode and cascade amplifier?
cascade: the output of one amplifier stage is connected to the input of another amplifier stages, it's also connected in series. cascode: it said to be cascode, when it has one transistor on the top of another where a common emitter transistor drives a common base transistor.
Why cascode amplifier is used for wide bandwidth applications?
A cascode amplifier is used for wide bandwidth applications primarily due to its ability to reduce the Miller effect, which can significantly limit bandwidth in traditional amplifier configurations. By stacking a common-emitter (or common-source) stage with a common-base (or common-gate) stage, the cascode configuration maintains high gain while minimizing the capacitance seen by the input, leading to improved frequency response. Additionally, the cascode architecture provides better isolation between stages, further enhancing stability and linearity across a wide frequency range. This results in a more efficient and effective amplification in high-speed applications.
Why is the gain and bandwidth of a ce-cb cascode amplifier greater than a ce amplifier?
Gain of ce-cb cascode is nearly equal to the gain of ce amplifier, because in a ce-cb cascode, the gain of the ce stage is equal to 1, and the gain of the cb stage is nearly equal to an isolated ce amplifier. Hence, gain of both are nearly equal. On the other hand, Bandwidth of ce-cb cascode is much higher than the bandwidth of ce amplifier because the cb stage in the cascode configration is not subjected to any Miller effect, thereby improving the high frequency response. The absence of Miller effect is due to the fact that the base of the cb stage is grounded thus, shielding the collector signal from being fed back into the emitter input. To be more clear, the gain of CE stage in cascode is nearly 1, which reduces the miller effect on the cb stage greatly.
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