Homework Answers
| Freq (Hz) | Gain (dB) |
| 0 | 0 |
| 25 | 20 |
| 45 | 30 |
| 75 | 55 |
| 100 | 70 |
| 350 | 160 |
| 650 | 180 |
| 850 | 187 |
| 1000 | 190 |
| 2500 | 190 |
| 4500 | 190 |
| 7500 | 190 |
| 70000 | 190 |
| 75000 | 187 |
| 85000 | 180 |
| 95000 | 175 |
| 100000 | 170 |
| 150000 | 150 |
| 280000 | 70 |
| 650000 | 15 |
| 850000 | 5 |
| 1000000 | 0 |
In the above table, bold values represents the three picked points (other than major ticks)
Mid-band gain = 190 dB (Maximum flat value)
Half power points are the 3dB down from mid band gain (Here it is 187dB) and their corresponding frequencies are at fH = 75000 Hz and fL = 850 Hz.
Bandwidth = fH - fL = 74150 Hz
Vin = 10 mV = 0.01V, R= 1.5 kohm
Gain (dB) = 20 log (Vo/Vin)
midband gain = 190 db = 20 log (vo/ 0.01)
9.5=log (vo/ 0.01)
vo= 31.6MV
output midband Power = vo * vo/R = 665.71 ohm
Similarly, half power gain = 187 dB = 20 log (vh/ 0.01)
9.35=log (vh/ 0.01)
vh=22.39 MV
Half power = vh*vh/R = 334.21 ohm
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