Bjt Common Emitter Amplifier
Electronic Analog 1 (EMT 112) Semester II 2009/2010
Exp . 1
UNIVERSITI MALAYSIA PERLIS
ANALOG ELECTRONICS 1 EMT 112/4
EXPERIMENT # 1 BJT COMMON EMITTER AMPLIFIER ‘Q’ POINT DC CURRENTS & VOLTAGES LOAD LINES VOLTAGE GAIN
MARKS
Pre Lab
DC I&V 5
βDC 1
5
DC load line 3
re 1
Av 3
D 4
C 3
Total 25
NAME
PROGRAMME
MATRIK #
DATE
1
Electronic Analog 1 (EMT 112) Semester II 2009/2010
Exp . 1
EXPERIMENT 1 BJT Common Emitter Amplifier 1. OBJECTIVE:
1.1 DC OPERATIONAL EFFECTS The experimental objectives are to: i) Compare the amplifier theoretical and practical DC operational values, and in particular the ‘quiescent’ operating point (‘Q’ point). ii) Determine the effect of coupling capacitors and bypass capacitors on the ‘Q’ point. iii) Determine the effect of the load on the ‘Q’ point. iv) Determine the transistor operational βDC and compare with the 2N3904 data sheet. v) Draw the DC load line. 1.2 AC OPERATION The experimental objectives are to: i) Compare the theoretical and practical amplifier voltage gain. ii) Determine the effect of the load on the amplifier voltage gain. . iii) Observe the effect of unbypassed emitter resistors.
2.
INTRODUCTION:
In this lab, the common-emitter configuration will be investigated. This common-emitter amplifier typically uses a self biasing scheme and has a relatively linear output. The common-emitter amplifier is characterized by high voltage (Av) and current gain (Ai).The amplifier typically has a relatively high input resistance (1 to 10k ohms) and is generally used to drive medium to high resistance loads. The circuit for the common-emitter can be seen in Figure 1. It is used in applications where a small voltage signal needs to be amplified to a large voltage signal. Since the amplifier cannot drive low resistance loads, it is usually cascaded with a buffer that can acts as a driver.
FIGURE 1: Common Emitter Amplifier.
3.
EQUIPMENT:
2.1 2.2 2.3 2.4
Exp . 1
UNIVERSITI MALAYSIA PERLIS
ANALOG ELECTRONICS 1 EMT 112/4
EXPERIMENT # 1 BJT COMMON EMITTER AMPLIFIER ‘Q’ POINT DC CURRENTS & VOLTAGES LOAD LINES VOLTAGE GAIN
MARKS
Pre Lab
DC I&V 5
βDC 1
5
DC load line 3
re 1
Av 3
D 4
C 3
Total 25
NAME
PROGRAMME
MATRIK #
DATE
1
Electronic Analog 1 (EMT 112) Semester II 2009/2010
Exp . 1
EXPERIMENT 1 BJT Common Emitter Amplifier 1. OBJECTIVE:
1.1 DC OPERATIONAL EFFECTS The experimental objectives are to: i) Compare the amplifier theoretical and practical DC operational values, and in particular the ‘quiescent’ operating point (‘Q’ point). ii) Determine the effect of coupling capacitors and bypass capacitors on the ‘Q’ point. iii) Determine the effect of the load on the ‘Q’ point. iv) Determine the transistor operational βDC and compare with the 2N3904 data sheet. v) Draw the DC load line. 1.2 AC OPERATION The experimental objectives are to: i) Compare the theoretical and practical amplifier voltage gain. ii) Determine the effect of the load on the amplifier voltage gain. . iii) Observe the effect of unbypassed emitter resistors.
2.
INTRODUCTION:
In this lab, the common-emitter configuration will be investigated. This common-emitter amplifier typically uses a self biasing scheme and has a relatively linear output. The common-emitter amplifier is characterized by high voltage (Av) and current gain (Ai).The amplifier typically has a relatively high input resistance (1 to 10k ohms) and is generally used to drive medium to high resistance loads. The circuit for the common-emitter can be seen in Figure 1. It is used in applications where a small voltage signal needs to be amplified to a large voltage signal. Since the amplifier cannot drive low resistance loads, it is usually cascaded with a buffer that can acts as a driver.
FIGURE 1: Common Emitter Amplifier.
3.
EQUIPMENT:
2.1 2.2 2.3 2.4