LAB 6: BJT AMPLIFIER LEARNING OUTCOMES: In this lab, students design and implement single-stage BJT amplifiers and observe amplitude and frequency response. Breadboard and the Analog Discovery Kit are to be used. The students will use various tools and functions from the Waveform software to perform measurement and plotting amplifier response. The students will compare the gain and frequency response of the BJT amplifier and the MOSFET amplifier in Lab 5. MATERIAL AND EQUIPMENT Material Equipment 2N2222 npn BJT transistor Breadboard Capacitors Multimeter Resistors Analog Discovery 2N2907 pnp BJT transistor Digilent Waveform software Curve tracer PRE-LAB Look at the handout and be familiar with the CE amplifier. You need to know how to calculate the DC voltage, current and small-signal gain. Design an amplifier with a voltage gain of -4, a collector current of 5 mA, bias the collector voltage to provide a maximum output voltage swing (i.e., ½ of Vcc). Use a Vcc of +5 V from the power supply of the Analog Discovery unit. PROCEDURES 1. NPN transistor characteristics Obtain 2N2222 Si npn from the lab instructor or from the technician in room 2C97. Measure their βDC at VCE =5V using the Tektronix curve tracers. Use a scale of 0 - 10 mA for IC and 0 - 10 V for VCE. The step current for the base is 10uA. You need to capture the transistor characteristics to your lab report. Label βDC on the curves. The normal βDC of 2N2222 is between 100-200. Also use the information in Lab 5 BJT IV curve. 2. Common-Emitter amplifier Construct the circuit shown in Figure 1. You can use either 1 uF for capacitor C B and 4.7 uF for the capacitor C C . A. Measure the DC currents and voltages: IB, IC, IE, VC, VB, VE. Remember to measure one at a time and NO input AC signal. In your report, make a table and list the results from your experiment and hand calculations. In your hand calculation, use β determined from your IV curve. Assume VBE = 0.7V.
5
Embed
LAB 6: BJT AMPLIFIER - College of Engineering - … 6: BJT AMPLIFIER LEARNING OUTCOMES: In this lab, students design and implement single-stage BJT amplifiers and observe amplitude
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
LAB 6: BJT AMPLIFIER
LEARNING OUTCOMES:
In this lab, students design and implement single-stage BJT amplifiers and observe
amplitude and frequency response. Breadboard and the Analog Discovery Kit are to be
used. The students will use various tools and functions from the Waveform software to
perform measurement and plotting amplifier response. The students will compare the gain
and frequency response of the BJT amplifier and the MOSFET amplifier in Lab 5.