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3 cards from this section. Quick, good the night before a test.
What is the purpose of a Beta-Helper Circuit in current mirrors?
Think about what happens to base current in a BJT.
Define early voltage and its significance.
Consider what happens to a transistor’s output as the voltage changes.
What does a Beta-Helper Circuit primarily compensate for?
Focus on the term 'Beta-Helper' and remember what it assists with.
True or False: Early voltage is unimportant in designing current mirrors.
Reflect on its role in circuit performance.
You have a current mirror circuit that suffers from significant base current loss, resulting in an output that's 20% lower than expected. If the reference current is set at 1.2mA, how can introducing a Beta-Helper improve the situation? Provide calculations.
Evaluate how beta affects the fraction of the current going into the base.
How would you adjust a current mirror design that currently has an early voltage of 30V to achieve a more stable current output? What are the implications on design choices?
Consider the relationship between early voltage and the transistor's physical characteristics.
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