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If i for any reason want to make Vce_2 constant then do i have to add another transistor which would isolate Q2 from load and acting as a buffer for Q2..?Jony130 said:
A current buffer transistor is a type of transistor that is used to amplify and control the flow of current in an electronic circuit. It works by providing a high input impedance and low output impedance, allowing it to act as a buffer between two circuits.
The early effect, also known as the base-width modulation effect, is a phenomenon that occurs in transistors where the width of the base region changes with changes in the collector voltage. This can cause variations in the current gain of the transistor, leading to inaccuracies in the output signal.
A current buffer transistor can cancel the early effect by acting as a cascode, which means it is connected in series with another transistor. The output voltage of the first transistor will be the input voltage for the second transistor, effectively isolating the first transistor from the collector voltage changes and reducing the impact of the early effect.
The cascode configuration, made possible by using a current buffer transistor, has several advantages. It provides a high input impedance, low output impedance, and increased stability and linearity. It also reduces the impact of the early effect on the performance of the transistor.
One potential drawback of using a current buffer transistor in a cascode configuration is that it can introduce additional noise into the circuit. This noise may need to be carefully managed and minimized through proper design and layout of the circuit.
