AE_Lecture 5_Part C_continued_Simulated Frequency Domain Study of CB,CE,Emitter Degenerate Amplifier and CC Amplifier.

In this Lecture , we carry out the frequency domain studies of Common Base, Common Emitter, Emitter Degenerate Amplifier and Common Collector Amplifier. These studies had been carried in Laboratory also. We find that the frequency response Band Width of the two studies have a remarkable correspondence. The simulation has been carried out using Multisim Simulation Software marketed by National Instruments.

Figure 1

Figure 2

Common Emitter Circuit Schematics is given in Figure 1c. The Gain Magnitude Plot and Gain Phase plot are given in Figure 1 and 1b.

By inspecting Figure 1 we find a Band-width of 5Mhz. The midband gain is 43dB and -3dB frequencies are i.e. 40dB frequencies are 10Hz and 5Mhz.

Figure 3

Figure 4

Emitter Degenerate Circuit Schematics is given in Figure 2c. The Gain Magnitude Plot and Gain Phase plot are given in Figure 2 and 2b.

By inspecting Figure 2 we find a Band-width of 10Mhz. The midband gain is 7dB and -3dB frequencies are i.e. 4dB frequencies are (less than 1Hz) and 10Mhz.

Emitter Degenerate Amplifier is a negative feedback amplifier with current-series feedback. The improvement is little less than 2× .

Figure 5

Figure 6

Figure 7

Figure 8

Common Base Circuit Schematics is given in Figure 3c. The Gain Magnitude Plot and Gain Phase plot are given in Figure 3 and 3b.

By inspecting Figure 3 we find a Band-width of 5Mhz. The midband gain is 43dB and -3dB frequencies are i.e. 40dB frequencies are 500Hz and 5Mhz.

Figure 9

Figure 10

Common Collector Circuit Schematics is given in Figure 4c. The Gain Magnitude Plot and Gain Phase plot are given in Figure 4 and 4b.

By inspecting Figure 1 we find a Band-width of 4GHz. The midband gain is 0dB and -3dB frequencies are (less than 1Hz) and 4GHz.

Figure 11

Figure 12

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This work is licensed by Bijay_Kumar Sharma under a Creative Commons Attribution License (CC-BY 3.0), and is an Open Educational Resource.

Last edited by Bijay_Kumar Sharma on Mar 15, 2010 10:11 am -0500.