In a self-biased RF amplifier stage: plate...

Question 1 / 27070

Question 1 of 27070sjZ4UrYP6pVDB4NL2MSY

In a self-biased RF amplifier stage: plate voltage is 1250 V, plate current 150 ma, grid current 15 ma, grid-leak resistance of 4000 ohms, what is the operating grid bias?

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Question 1 of 27070

In a self-biased RF amplifier stage: plate voltage is 1250 V, plate current 150 ma, grid current 15 ma, grid-leak resistance of 4000 ohms, what is the operating grid bias?

🔍 Key Concepts

• Relationship between grid current, grid-leak resistance, and resulting grid bias voltage in a self-biased RF amplifier • Using Ohm’s Law (V = I × R) correctly with units (mA vs A) • Distinguishing between plate circuit values and grid circuit values—which ones actually affect the grid bias calculation

💭 Think About

• Which given current value actually flows through the grid-leak resistor, and which currents are unrelated to the grid bias calculation? • How do you convert the grid current from milliamps to amps before using Ohm’s Law with the 4000-ohm resistor? • Once you calculate the voltage across the grid-leak resistor, should the grid be negative or positive with respect to the cathode in normal RF amplifier operation?

✅ Before You Answer

• Confirm you are using only the grid current with the grid-leak resistance for the bias calculation • Double-check your unit conversion (mA to A) before multiplying by resistance • Verify that your final grid bias value matches one of the choices and has the correct sign and magnitude for typical RF amplifier operation