17.7.2. Gain Calculation

Try these first

1. 1.

   Define gain in an electronic circuit.

   Hint

   Think about how the input signal is affected by the circuit.

2. 2.

   What is transconductance?

   Hint

   It's a measure of control by input voltage over output current.

3. 3.

   What is the formula for calculating gain in a circuit with a MOSFET?

   • G = g_m × R_D
   • G = -g_m × R_D
   • G = R_D/g_m

   Hint

   Remember how MOSFETs behave in terms of output phase.

4. 4.

   True or False: Gain can be calculated without knowing the output voltage.

   • True
   • False

   Hint

   Reflect on the definition of gain as a ratio.

5. 5.

   Design a MOSFET amplifier circuit with given specifications: gain of 10, supply voltage of 12V, and ensure the device operates within the saturation region. Provide calculations and justifications.

   Hint

   Use \\( G = -g_m × R_D \\) to set your values and check with characteristic curves.

6. 6.

   You are given a circuit with a MOSFET and a load resistor. If the output voltage is 6V, and input current is 2mA, compute transconductance and ensure proper calculation of the gain.

   Hint

   Review the definitions of V_GS and output relationships.