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In small-signal models, what does the transconductance (gm) represent?

Practice Questions

Q1
In small-signal models, what does the transconductance (gm) represent?
  1. The ratio of output current to input voltage
  2. The ratio of input current to output voltage
  3. The change in output current per change in input voltage
  4. The change in input voltage per change in output current

Questions & Step-by-Step Solutions

In small-signal models, what does the transconductance (gm) represent?
  • Step 1: Understand that transconductance (gm) is a measure used in electronics.
  • Step 2: Recognize that it relates to how a device responds to small changes in input.
  • Step 3: Identify that 'output current' refers to the current flowing out of the device.
  • Step 4: Identify that 'input voltage' refers to the voltage applied to the device.
  • Step 5: Realize that transconductance (gm) tells us how much the output current changes when the input voltage changes.
  • Step 6: Remember that this concept is used in small-signal models, which analyze small variations around a specific operating point.
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