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Frequency response of bjt amplifier experiment


frequency response of bjt amplifier experiment

Check your DC operating point by measuring IC, VE, VC and.
Have your lab data sheet checked off by your TA before submitting the lab report.
Using the simulator, find the higher 3-dB frequency (fH) while.
The AWG output has a 50 series output resistance and you will need to include it along with the external resistance in series with its output.
Prepare a data sheet showing your simulated and measured values.Miller capacitor CF is a small capacitance that will be rome total war barbarian invasion unit cheat codes used to control the high frequency 3-dB response of the amplifier.Calculate the value of CF to have fH 50 kHz.Submit all necessary simulation plots showing that the specifications are satisfied.Since the topology and the requirements might be slightly different than in the text, you will need to make minor modifications to the design procedure and equations.Using something like that shown in figure 4 will provide both an attenuation factor of 1/8 and a 60 equivalent source resistance.Using short-circuit time constant analysis, the lower 3-dB frequency (?L) can be found as: Where, figure 3 shows the high-frequency small-signal equivalent circuit of the amplifier.Simulate the circuit to verify your result, and adjust the value of CF if necessary.RIN 250, isupply 8mA.Construct the amplifier, based on the schematic in figure 1, you designed in the pre-lab.Note that CF is ignored since it is assumed that its impedance at these frequencies is very high.



You can find the DC collector current (IC) and the resistor values following the analysis provided in your text book.
RB is the parallel combination of RB1 and RB2.
For further experimentation replace each capacitor with ones that are factors of 2 and 10 larger and smaller than your design values and re-measure the response curve with the Network Analyzer instrument.Be prepared to discuss your experiment with your.Also because of the relatively high gain of your design you will need an input signal with a small amplitude of around 100mV.The higher 3-dB frequency (?H) can be derived as: Where, thus, if we assume that the common-emitter amplifier is properly characterized by these dominant low and high frequency poles, then the frequency response of the amplifier can be approximated by: Assuming CB CC.Do this to only one capacitor at a time to observe its individual effect on the response.Figure 2: Low-frequency equivalent circuit.Calculate CB, CC, CE to have fL 500.Figure 1: Common-emitter BJT amplifier.At high frequencies, CB, CC and CE can be replaced with short circuits since their impedance becomes very small compared to RS, RL and.Also steam resume while playing provide the circuit schematic with DC bias points annotated.


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