| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision |
| university:courses:electronics:electronics-lab-5 [01 Feb 2019 13:12] – add ltspice files Antoniu Miclaus | university:courses:electronics:electronics-lab-5 [12 Jul 2019 13:02] – Pop Andreea |
|---|
| ====== Activity 5. Common Emitter Amplifier ====== | ====== Activity: Common Emitter Amplifier ====== |
| |
| ===== Objective: ===== | ===== Objective: ===== |
| {{ :university:courses:electronics:a5_e2.png?200 |}} | {{ :university:courses:electronics:a5_e2.png?200 |}} |
| |
| Alternately, the curve tracer circuit from activity 4. can be modified slightly, (might be simplest way since it was already constructed in the earlier section) to produce a common emitter amplifier test circuit shown below. All the attributes are basically the same with two slight advantages. One is the base current bias is no longer dependent on the exponential base voltage (V<sub>BE</sub>). The second is the summation of the small AC signal from the attenuated AWG 1 output is independent of the base bias circuit and does not need to be AC coupled. The small signal AC input is applied to the non-inverting terminal of the op-amp and thus due to the negative feedback also appears at the base of the transistor (inverting op-amp input). | Alternately, the curve tracer circuit from activity 7 can be modified slightly, (might be simplest way since it was already constructed in the earlier section) to produce a common emitter amplifier test circuit shown below. All the attributes are basically the same with two slight advantages. One is the base current bias is no longer dependent on the exponential base voltage (V<sub>BE</sub>). The second is the summation of the small AC signal from the attenuated AWG 1 output is independent of the base bias circuit and does not need to be AC coupled. The small signal AC input is applied to the non-inverting terminal of the op-amp and thus due to the negative feedback also appears at the base of the transistor (inverting op-amp input). |
| |
| {{ :university:courses:electronics:a5_f2.png?500 |}} | {{ :university:courses:electronics:a5_f2.png?500 |}} |
| <WRAP centeralign> Figure 10 C<sub>2</sub> added to increase AC gain </WRAP> | <WRAP centeralign> Figure 10 C<sub>2</sub> added to increase AC gain </WRAP> |
| |
| | <WRAP round download> |
| ** Lab Resources:** | ** Lab Resources:** |
| * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/comm_emit_amp_bb | comm_emit_amp_bb]] | * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/comm_emit_amp_bb | comm_emit_amp_bb]] |
| * LTspice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/comm_emit_amp_ltspice | comm_emit_amp_ltspice]] | * LTspice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/comm_emit_amp_ltspice | comm_emit_amp_ltspice]] |
| | </WRAP> |
| |
| ==== References for further reading: ==== | ==== References for further reading: ==== |
