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?
• 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
• 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?
• 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
No comments yet
Be the first to share your thoughts!