Lab3_2C_2007

Lab3_2C_2007 - ECE 2C Laboratory Manual 3 Frequency...

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1 © Bob York ECE 2C Laboratory Manual 3 Frequency Response of Transistor Amplifiers Overview This lab will continue our exploration of single-transistor amplifiers using BJTs. We will explore the frequency response of some simple BJT amplifiers, and examine the factors affecting the low- and high-frequency cutoff frequencies in these amplifiers. Table of Contents Pre-lab Preparation 2 Before Coming to the Lab 2 Parts List 2 In-Lab Procedure 2 3.1 Common-Emitter Amplifier 2 Low-Frequency Response 2 High-Frequency Response 3 3.2 Common-Base Amplifier 3 Low-Frequency Response 4 High-Frequency Response 4 3.3 Multi-Stage Amplifier Example 4
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2 Frequency Response of Transistor Amplifiers © Bob York 2 Pre-lab Preparation Before Coming to the Lab Read through the lab experiment to familiarize yourself with the components and assembly sequence. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. Parts List Use parts from Lab #2 In-Lab Procedure 3.1 Common-Emitter Amplifier Figure 3-1 shows an AC- coupled common-emitter amplifier, similar to the CS amplifiers from the previous lab. We will use this circuit to explore the frequency response of the CE/CS amplifier topology. Since the circuit has a rather high gain, we have included a resistor divider network at the input to keep the input signal small. Using a 2N3904 in the circuit of Figure 3-1, first calculate the base resistance 1 b R that is needed to bias the device at a collector voltage of 67 V c V  . Assume a nominal value of 200 for this calculation (document your work in your lab report). Build the circuit using your calculated value of 1 b R , and record the DC voltage at the collector, base, and emitter. From these measurements, estimate the collector current c I , and transconductance m g . Low-Frequency Response Adjust the function generator for a 0.1 V amplitude sinewave at 10 kHz and apply to the circuit using the voltage divider shown. Record the waveforms at the points in V and out V , and compute the gain of the amplifier circuit / vo out in AVV .
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Lab3_2C_2007 - ECE 2C Laboratory Manual 3 Frequency...

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