Discussion
Consider the following statements about active loads.
1. They raise the gain towards the device's intrinsic limit
2. They occupy less area than an equivalent integrated resistor
3. They increase the output voltage headroom available
Which of the statements given above is or are correct?
Answer: C
The first two are correct and the third is the reverse: a current source needs some voltage across it to remain a current source, so headroom is lost rather than gained. The gain and area benefits are real and are why the technique dominates integrated design. A statement that reverses the cost of a technique into a benefit is worth checking against what the component physically requires.
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