| Mixers | |||||||||||||
| Voltage gain in demodulation is a result of integration during the switch on-time | |||||||||||||
| That gain is calculated here for serial switch mixers as function of three different switch on-times | |||||||||||||
| integral (sin x)dx = -cos x | |||||||||||||
| The integral shall be calculated over the on-time of the switch and divided by length of integration time (radians) | |||||||||||||
| in order to get the integrated voltage. | |||||||||||||
| time | time | 45 degrees on-time | 90 degrees on-time | 180 degrees on-time | |||||||||
| x | x | =(-cos(x+22.5) + cos(x-22.5))/ PII()*4 | =(-cos(x+45) + cos(x-45))/ PII()*2 | =(-cos(x+90) + cos(x-90))/ PII() | |||||||||
| degrees | radians | -cos x | 45 deg diff | dB | 90 deg diff | dB | 180 deg diff | dB | |||||
| 0.0 | 0 | -1.000 | |||||||||||
| 22.5 | 0.393 | -0.924 | 0.373 | -8.568 | |||||||||
| 45.0 | 0.785 | -0.707 | 0.689 | -3.235 | 0.637 | -3.922 | |||||||
| 67.5 | 1.178 | -0.383 | 0.900 | -0.912 | 0.832 | -1.600 | |||||||
| 90.0 | 1.571 | 0.000 | 0.974 | -0.224 | 0.900 | -0.912 | 0.637 | -3.922 | |||||
| 112.5 | 1.963 | 0.383 | 0.900 | -0.912 | 0.832 | -1.600 | 0.588 | -4.610 | |||||
| 135.0 | 2.356 | 0.707 | 0.689 | -3.235 | 0.637 | -3.922 | 0.450 | -6.933 | |||||
| 157.5 | 2.749 | 0.924 | 0.373 | -8.568 | 0.345 | -9.255 | 0.244 | -12.266 | |||||
| 180.0 | 3.142 | 1.000 | 0.000 | -316.994 | 0.000 | -316.994 | 0.000 | -322.159 | |||||
| 202.5 | 3.534 | 0.924 | -0.373 | -8.568 | -0.345 | -9.255 | -0.244 | -12.266 | |||||
| 225.0 | 3.927 | 0.707 | -0.689 | -3.235 | -0.637 | -3.922 | -0.450 | -6.933 | |||||
| 247.5 | 4.320 | 0.383 | -0.900 | -0.912 | -0.832 | -1.600 | -0.588 | -4.610 | |||||
| 270.0 | 4.712 | 0.000 | -0.974 | -0.224 | -0.900 | -0.912 | -0.637 | -3.922 | |||||
| 292.5 | 5.105 | -0.383 | -0.900 | -0.912 | -0.832 | -1.600 | -0.588 | -4.610 | |||||
| 315.0 | 5.498 | -0.707 | -0.689 | -3.235 | -0.637 | -3.922 | -0.450 | -6.933 | |||||
| 337.5 | 5.890 | -0.924 | -0.373 | -8.568 | -0.345 | -9.255 | -0.244 | -12.266 | |||||
| 360.0 | 6.283 | -1.000 | 0.000 | -310.973 | 0.000 | -313.472 | 0.000 | -316.138 | |||||
| 382.5 | 6.676 | -0.924 | 0.373 | -8.568 | 0.345 | -9.255 | 0.244 | -12.266 | |||||
| 405.0 | 7.069 | -0.707 | 0.689 | -3.235 | 0.637 | -3.922 | 0.450 | -6.933 | |||||
| 427.5 | 7.461 | -0.383 | 0.900 | -0.912 | 0.832 | -1.600 | 0.588 | -4.610 | |||||
| 450.0 | 7.854 | 0.000 | 0.974 | -0.224 | 0.900 | -0.912 | 0.637 | -3.922 | |||||
| 472.5 | 8.247 | 0.383 | 0.900 | -0.912 | 0.832 | -1.600 | |||||||
| 495.0 | 8.639 | 0.707 | 0.689 | -3.235 | 0.637 | -3.922 | |||||||
| 517.5 | 9.032 | 0.924 | 0.373 | -8.568 | |||||||||
| 540.0 | 9.425 | 1.000 | |||||||||||
| Additional power attenuation may come from impedance level change. | |||||||||||||
| 24.12.2009 | OH1TV | ||||||||||||
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