Common-Emitter Amplifier - MWFTR

More documents

Recommendations

Info

Swamped Common Emitter AmplifierDr. Charles KimThe only change here in the most popular Common Emitter Amplifier is that we increase the ACresistance of the Emitter circuit to reduce variations in voltage gain. The Common EmitterAmplifier circuit is shown below:As you see above, part of the Emitter resistance is bypassed by the capacitor C E .DC ANALYSIS:8
AC ANALYSIS:Dr. Charles KimFREQUENCY ANALYSIS:Well, we’ve run far and, thankfully, this is the last subject of the discussion. Before we said, inAC analysis, we short out capacitors when the AC signal frequency is high. This means thatwhen AC signal frequency is low, the capacitor cannot be removed from the consideration. Thenhow “high” is high enough? This will answer the bandwidth of our Common Emitter Amplifier.Let’s get the AC analysis circuit with capacitors are not shorted out.Let’s look at the left circled circuit part, A. If we reduce the circuit A then, we can see the circuitfrom V in to the Base of the BJT (which is the input coupling circuit) forms a simple typicalpassive high pass filter circuit. It’s cutoff frequency is determined by the capacitor and resistor.9
Page 1 and 2: Dr. Charles KimCommon-Emitter Ampli
Page 3: Dr. Charles KimHow about Thevenin r
Page 7: Dr. Charles KimWhew! After a long r
Page 11 and 12: B.2 SimulationDr. Charles KimSince
Page 13: Dr. Charles KimThen we place two vo

Common-Emitter Amplifier - MWFTR

Create successful ePaper yourself

Delete template?

Save as template?