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3 cards from this section. Quick, good the night before a test.
What is the minimum voltage needed to turn on Q1 and Q2 in a differential amplifier?
Refer to the principles of V_BE.
What happens to the output if the collector voltage approaches the supply voltage?
Think about the relationship between supply voltage and output signal levels.
What is the threshold voltage for a BJT to turn on?
Think about the base-emitter junction characteristics.
True or False: Common mode voltage should ideally be equal to the threshold voltage for optimal operation.
Consider the operational range of differential amplifiers.
Given a differential amplifier using BJTs with a common mode voltage of 3 V and a threshold voltage of 0.6 V, determine whether the transistors are operating in the saturation region. Explain your reasoning.
Draw out the voltage levels to visualize their interactions.
Calculate the differential voltage gain for a differential amplifier with a differential mode gain of 50 and a common mode gain of -5. How does this affect the output signal?
Remember to factor in the effects of common mode gain on ideal signal outputs.
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