06-22-2014, 12:17 PM
Итак, самое интересное: как всё-таки лучше делать предварительный усилитель.
Цель-схема обеспечивающая наименьшие искажения при больших уровнях звукового давления.
К двум предыдущим вариантам добавим вариант преда предложенного Carbon с Вегалаба
с некоторыми изменениями в номиналах элементов.
Входной сигнал будем пересчитывать в эквивалентное значение звукового давления на
основании измеренных ранее параметров.
Моделируемая схема:
Результаты моделирования из LTSPICE лог файла
Те же результаты, сведённые в таблицу:
Мне кажется что комментарии излишни!
Файлы моделирования прилагаются.
.
Цель-схема обеспечивающая наименьшие искажения при больших уровнях звукового давления.
К двум предыдущим вариантам добавим вариант преда предложенного Carbon с Вегалаба
с некоторыми изменениями в номиналах элементов.
Входной сигнал будем пересчитывать в эквивалентное значение звукового давления на
основании измеренных ранее параметров.
Моделируемая схема:
Результаты моделирования из LTSPICE лог файла
Код:
.step spl_db=100
N-Period=1
Fourier components of V(original)
DC component:0.000203379
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 2.052e-01 1.000e+00 178.25° 0.00°
2 2.000e+04 3.488e-04 1.700e-03 -107.94° -286.18°
3 3.000e+04 1.577e-05 7.687e-05 178.54° 0.30°
4 4.000e+04 1.474e-06 7.184e-06 -9.85° -188.09°
5 5.000e+04 1.194e-06 5.817e-06 0.04° -178.21°
6 6.000e+04 9.919e-07 4.835e-06 0.07° -178.18°
7 7.000e+04 8.502e-07 4.144e-06 0.06° -178.19°
8 8.000e+04 7.439e-07 3.626e-06 0.05° -178.20°
9 9.000e+04 6.612e-07 3.223e-06 0.04° -178.20°
Total Harmonic Distortion: 0.170202%
N-Period=1
Fourier components of V(linkwitz)
DC component:-4.08855e-006
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 4.600e-02 1.000e+00 -0.39° 0.00°
2 2.000e+04 3.944e-06 8.576e-05 77.60° 77.99°
3 3.000e+04 2.488e-08 5.409e-07 9.13° 9.51°
4 4.000e+04 1.655e-08 3.598e-07 179.73° 180.12°
5 5.000e+04 1.322e-08 2.874e-07 -179.99° -179.61°
6 6.000e+04 1.102e-08 2.395e-07 -180.00° -179.61°
7 7.000e+04 9.442e-09 2.053e-07 -180.00° -179.61°
8 8.000e+04 8.262e-09 1.796e-07 -180.00° -179.61°
9 9.000e+04 7.343e-09 1.597e-07 -180.00° -179.61°
Total Harmonic Distortion: 0.008576%
N-Period=1
Fourier components of V(carbon)
DC component:-4.05752e-006
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 5.928e-02 1.000e+00 -0.05° 0.00°
2 2.000e+04 2.251e-10 3.798e-09 -179.79° -179.74°
3 3.000e+04 1.500e-10 2.530e-09 -179.68° -179.63°
4 4.000e+04 1.123e-10 1.894e-09 -180.00° -179.95°
5 5.000e+04 8.967e-11 1.513e-09 -179.99° -179.94°
6 6.000e+04 7.455e-11 1.258e-09 -179.99° -179.94°
7 7.000e+04 6.374e-11 1.075e-09 -179.99° -179.94°
8 8.000e+04 5.561e-11 9.381e-10 -179.99° -179.94°
9 9.000e+04 4.925e-11 8.309e-10 -180.00° -179.94°
Total Harmonic Distortion: 0.000001%
.step spl_db=110
N-Period=1
Fourier components of V(original)
DC component:0.00156806
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 6.472e-01 1.000e+00 178.24° 0.00°
2 2.000e+04 3.404e-03 5.260e-03 -108.23° -286.47°
3 3.000e+04 5.445e-04 8.413e-04 178.57° 0.32°
4 4.000e+04 2.836e-05 4.381e-05 -64.58° -242.82°
5 5.000e+04 1.371e-05 2.119e-05 -1.06° -179.31°
6 6.000e+04 1.060e-05 1.638e-05 0.44° -177.81°
7 7.000e+04 9.058e-06 1.400e-05 0.19° -178.05°
8 8.000e+04 7.926e-06 1.225e-05 0.15° -178.09°
9 9.000e+04 7.045e-06 1.089e-05 0.14° -178.11°
Total Harmonic Distortion: 0.532706%
N-Period=1
Fourier components of V(linkwitz)
DC component:-2.54941e-005
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 1.454e-01 1.000e+00 -0.39° 0.00°
2 2.000e+04 3.942e-05 2.710e-04 77.58° 77.97°
3 3.000e+04 1.261e-06 8.668e-06 5.68° 6.07°
4 4.000e+04 1.676e-07 1.152e-06 177.32° 177.71°
5 5.000e+04 1.322e-07 9.089e-07 -179.97° -179.58°
6 6.000e+04 1.100e-07 7.562e-07 -179.99° -179.60°
7 7.000e+04 9.427e-08 6.481e-07 -179.99° -179.60°
8 8.000e+04 8.248e-08 5.671e-07 -179.99° -179.60°
9 9.000e+04 7.332e-08 5.041e-07 -179.99° -179.60°
Total Harmonic Distortion: 0.027116%
N-Period=1
Fourier components of V(carbon)
DC component:-1.28295e-005
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 1.874e-01 1.000e+00 -0.05° 0.00°
2 2.000e+04 7.422e-10 3.959e-09 -179.36° -179.30°
3 3.000e+04 4.962e-10 2.647e-09 -176.98° -176.93°
4 4.000e+04 3.703e-10 1.975e-09 -180.00° -179.95°
5 5.000e+04 2.958e-10 1.578e-09 -179.99° -179.94°
6 6.000e+04 2.460e-10 1.312e-09 -180.00° -179.94°
7 7.000e+04 2.104e-10 1.122e-09 -180.00° -179.95°
8 8.000e+04 1.836e-10 9.794e-10 -180.00° -179.95°
9 9.000e+04 1.627e-10 8.680e-10 -180.00° -179.95°
Total Harmonic Distortion: 0.000001%
.step spl_db=120
N-Period=1
Fourier components of V(original)
DC component:-0.0750281
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 1.988e+00 1.000e+00 178.31° 0.00°
2 2.000e+04 2.940e-02 1.479e-02 -105.76° -284.07°
3 3.000e+04 1.734e-02 8.719e-03 176.79° -1.52°
4 4.000e+04 2.627e-03 1.321e-03 -86.51° -264.83°
5 5.000e+04 9.423e-04 4.739e-04 -11.13° -189.44°
6 6.000e+04 5.614e-04 2.823e-04 4.93° -173.39°
7 7.000e+04 4.199e-04 2.112e-04 3.83° -174.48°
8 8.000e+04 3.615e-04 1.818e-04 0.61° -177.70°
9 9.000e+04 3.280e-04 1.650e-04 0.00° -178.31°
Total Harmonic Distortion: 1.722882%
N-Period=1
Fourier components of V(linkwitz)
DC component:-0.000199243
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 4.598e-01 1.000e+00 -0.39° 0.00°
2 2.000e+04 3.915e-04 8.514e-04 77.45° 77.84°
3 3.000e+04 4.486e-05 9.756e-05 5.08° 5.47°
4 4.000e+04 2.100e-06 4.567e-06 157.51° 157.90°
5 5.000e+04 1.428e-06 3.106e-06 -179.46° -179.07°
6 6.000e+04 1.131e-06 2.459e-06 -179.81° -179.42°
7 7.000e+04 9.696e-07 2.109e-06 -179.97° -179.58°
8 8.000e+04 8.485e-07 1.845e-06 -179.98° -179.59°
9 9.000e+04 7.542e-07 1.640e-06 -179.98° -179.59°
Total Harmonic Distortion: 0.085697%
N-Period=1
Fourier components of V(carbon)
DC component:-4.05679e-005
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 5.928e-01 1.000e+00 -0.05° 0.00°
2 2.000e+04 2.387e-09 4.027e-09 -178.00° -177.95°
3 3.000e+04 1.823e-09 3.075e-09 -153.10° -153.05°
4 4.000e+04 1.190e-09 2.008e-09 -180.00° -179.95°
5 5.000e+04 9.507e-10 1.604e-09 -180.00° -179.95°
6 6.000e+04 7.908e-10 1.334e-09 -180.00° -179.95°
7 7.000e+04 6.763e-10 1.141e-09 -180.00° -179.95°
8 8.000e+04 5.902e-10 9.957e-10 -180.00° -179.95°
9 9.000e+04 5.231e-10 8.825e-10 -180.00° -179.95°
Total Harmonic Distortion: 0.000001%
.step spl_db=130
N-Period=1
Fourier components of V(original)
DC component:-1.60904
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 4.330e+00 1.000e+00 -169.45° 0.00°
2 2.000e+04 6.335e-01 1.463e-01 -66.53° 102.92°
3 3.000e+04 3.964e-01 9.154e-02 -165.27° 4.18°
4 4.000e+04 1.345e-01 3.105e-02 -71.34° 98.11°
5 5.000e+04 5.869e-02 1.355e-02 67.32° 236.77°
6 6.000e+04 3.289e-02 7.595e-03 -176.11° -6.66°
7 7.000e+04 1.756e-02 4.056e-03 19.20° 188.65°
8 8.000e+04 1.321e-02 3.052e-03 84.88° 254.33°
9 9.000e+04 7.585e-03 1.752e-03 -107.77° 61.68°
Total Harmonic Distortion: 17.612597%
N-Period=1
Fourier components of V(linkwitz)
DC component:0.000208094
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 1.450e+00 1.000e+00 -0.39° 0.00°
2 2.000e+04 3.604e-03 2.486e-03 76.45° 76.85°
3 3.000e+04 1.559e-03 1.075e-03 4.74° 5.13°
4 4.000e+04 1.144e-04 7.891e-05 119.57° 119.96°
5 5.000e+04 5.311e-05 3.664e-05 -176.40° -176.01°
6 6.000e+04 2.178e-05 1.502e-05 -169.24° -168.84°
7 7.000e+04 1.778e-05 1.226e-05 -179.77° -179.38°
8 8.000e+04 1.626e-05 1.122e-05 179.49° 179.88°
9 9.000e+04 1.452e-05 1.002e-05 -179.99° -179.60°
Total Harmonic Distortion: 0.271011%
N-Period=1
Fourier components of V(carbon)
DC component:-0.000128275
Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+04 1.874e+00 1.000e+00 -0.05° 0.00°
2 2.000e+04 7.716e-09 4.116e-09 -173.80° -173.75°
3 3.000e+04 2.682e-08 1.431e-08 -103.53° -103.48°
4 4.000e+04 3.831e-09 2.044e-09 -179.99° -179.94°
5 5.000e+04 3.063e-09 1.634e-09 -179.98° -179.93°
6 6.000e+04 2.550e-09 1.360e-09 -180.00° -179.95°
7 7.000e+04 2.184e-09 1.165e-09 -180.00° -179.95°
8 8.000e+04 1.908e-09 1.018e-09 -180.00° -179.95°
9 9.000e+04 1.694e-09 9.038e-10 -180.00° -179.95°
Total Harmonic Distortion: 0.000002%
Measurement: original_out_rms
step RMS(v(original)) FROM TO
1 0.145076 0 0.001
2 0.457661 0 0.001
3 1.40784 0 0.001
4 3.45193 0 0.001
Measurement: linkwitz_out_rms
step RMS(v(linkwitz)) FROM TO
1 0.0325237 0 0.001
2 0.102846 0 0.001
3 0.325134 0 0.001
4 1.02507 0 0.001
Measurement: in_rms
step RMS(v(in)) FROM TO
1 0.0419144 0 0.001
2 0.132545 0 0.001
3 0.419144 0 0.001
4 1.32545 0 0.001
Measurement: carbon_out_rms
step RMS(v(carbon)) FROM TO
1 0.0419138 0 0.001
2 0.132543 0 0.001
3 0.419138 0 0.001
4 1.32543 0 0.001
Measurement: carbon_gain
step carbon_out_rms/in_rms
1 0.999986
2 0.999986
3 0.999986
4 0.999986
Measurement: original_gain
step original_out_rms/in_rms
1 3.46124
2 3.45287
3 3.35884
4 2.60435
Measurement: linkwitz_gain
step linkwitz_out_rms/in_rms
1 0.775955
2 0.775932
3 0.775709
4 0.773378Те же результаты, сведённые в таблицу:
Мне кажется что комментарии излишни!
Файлы моделирования прилагаются.
.
Nobody Is Perfect