[問題] hspice SFDR相關問題
想請問大家
輸入測試訊號
VSIGNALP VINP GND sin(ICMV 0.5 1K 2ns 0) ac 0.5
VSIGNALN VINN GND sin(ICMV -0.5 1K 2ns 0) ac 0.5 180
輸入指令
.tran 0.00097 5m
.FFT V(VINP,VINN) np=1024 start = 0 stop = 5m freq = 1k
+ window = kaiser alfa = 2.5
出來的結果為
fft components of transient response v(vinp,vinn)
Window: Kaiser-Bessel
DC: ON
First Harmonic: 1.0000k
Start Freq: 1.0000k
Stop Freq: 102.4000k
dc component: mag(dB)= -1.061E+02 mag= 4.957E-06 phase= 0.000E+00
frequency frequency fft_mag fft_mag
fft_phase
index (hz) (dB) (deg)
5 1.0000k 0. 1.0000 -90.0004
10 2.0000k -72.0814 248.8444u 90.3549
15 3.0000k -77.2969 136.5063u 91.0997
20 4.0000k -86.6892 46.2958u 91.6723
25 5.0000k -91.0560 28.0028u 92.0559
30 6.0000k -97.4841 13.3596u 92.8253
35 7.0000k -99.9970 10.0035u 92.9080
40 8.0000k -105.0342 5.6013u 93.4138
45 9.0000k -106.6130 4.6704u 93.8104
50 10.0000k -110.8826 2.8567u 94.3175
55 11.0000k -111.8828 2.5460u 94.6491
60 12.0000k -115.6435 1.6513u 95.1168
65 13.0000k -116.2680 1.5367u 95.1398
70 14.0000k -119.6832 1.0372u 95.9947
75 15.0000k -119.9818 1.0021u 96.0886
80 16.0000k -123.1564 695.3135n 96.9984
85 17.0000k -123.2457 688.2030n 97.4096
90 18.0000k -126.2004 489.7578n 98.2230
95 19.0000k -126.2426 487.3847n 97.2401
100 20.0000k -128.9801 355.6258n 99.2111
105 21.0000k -128.8213 362.1879n 97.6994
110 22.0000k -131.4578 267.3669n 99.7075
115 23.0000k -131.1226 277.8886n 98.9056
120 24.0000k -133.6502 207.7251n 100.0524
125 25.0000k -133.5485 210.1726n 98.1774
130 26.0000k -135.8033 162.1203n 100.3132
135 27.0000k -135.6474 165.0559n 98.4738
140 28.0000k -137.7332 129.8191n 103.5967
145 29.0000k -137.1451 138.9139n 102.0027
150 30.0000k -139.3641 107.5961n 104.4169
155 31.0000k -139.1319 110.5105n 103.1688
160 32.0000k -141.2093 87.0028n 101.7406
165 33.0000k -141.4439 84.6847n 98.9645
170 34.0000k -142.9444 71.2490n 104.5120
175 35.0000k -142.4054 75.8106n 102.2198
180 36.0000k -144.2004 61.6566n 106.7583
185 37.0000k -143.5680 66.3134n 107.3682
190 38.0000k -145.6916 51.9302n 103.8518
195 39.0000k -146.5037 47.2951n 102.4938
200 40.0000k -147.3682 42.8146n 106.1001
205 41.0000k -147.5938 41.7165n 101.7020
210 42.0000k -148.1756 39.0140n 112.3317
215 43.0000k -147.4443 42.4407n 110.8052
220 44.0000k -149.4436 33.7149n 108.4555
225 45.0000k -150.7290 29.0769n 109.6935
230 46.0000k -151.3435 27.0909n 105.9173
235 47.0000k -153.4935 21.1507n 97.3903
240 48.0000k -151.9699 25.2061n 114.9301
245 49.0000k -151.5159 26.5586n 108.8131
250 50.0000k -152.8611 22.7480n 112.6638
255 51.0000k -153.2606 21.7255n 120.9536
260 52.0000k -155.0481 17.6846n 108.9237
265 53.0000k -159.7017 10.3493n 114.8954
270 54.0000k -155.3614 17.0581n 120.6840
275 55.0000k -156.2463 15.4059n 114.0750
280 56.0000k -159.2224 10.9365n 100.8703
285 57.0000k -155.4523 16.8804n 125.8653
290 58.0000k -162.4401 7.5508n 74.7997
295 59.0000k -165.0667 5.5804n 153.5813
300 60.0000k -159.6626 10.3960n 122.2224
305 61.0000k -153.2806 21.6755n 159.5935
310 62.0000k -157.8334 12.8330n 129.0686
315 63.0000k -151.2860 27.2709n 151.0259
320 64.0000k -161.3298 8.5805n 118.0649
325 65.0000k -162.9051 7.1573n 176.6257
330 66.0000k -145.7001 51.8792n 174.0310
335 67.0000k -166.5848 4.6855n -142.5821
340 68.0000k -145.0972 55.6083n 171.5069
345 69.0000k -160.9782 8.9349n 138.5962
350 70.0000k -164.2570 6.1256n 100.2953
355 71.0000k -162.1355 7.8203n 173.8338
360 72.0000k -172.2454 2.4419n 53.4854
365 73.0000k -161.2914 8.6185n -120.5055
370 74.0000k -163.5449 6.6490n 152.4634
375 75.0000k -158.6188 11.7236n 179.0603
380 76.0000k -162.4696 7.5252n 145.1321
385 77.0000k -156.6404 14.7224n 172.4917
390 78.0000k -172.0663 2.4928n 176.5601
395 79.0000k -159.2217 10.9375n -130.3672
400 80.0000k -172.1381 2.4723n -61.4103
405 81.0000k -163.0214 7.0621n -134.8290
410 82.0000k -179.7623 1.0277n 145.3429
415 83.0000k -162.1498 7.8075n 167.4128
420 84.0000k -170.5194 2.9787n -167.2961
425 85.0000k -157.2593 13.7099n -154.4674
430 86.0000k -167.5418 4.1967n -141.1655
435 87.0000k -157.8002 12.8822n -140.4585
440 88.0000k -164.0480 6.2748n 167.0125
445 89.0000k -162.9832 7.0932n -174.4317
450 90.0000k -168.4941 3.7609n -173.1697
455 91.0000k -158.8779 11.3791n -154.3374
460 92.0000k -165.3302 5.4137n -119.4167
465 93.0000k -156.5262 14.9173n -127.2875
470 94.0000k -166.1462 4.9282n -172.4857
475 95.0000k -162.5247 7.4776n -147.1450
480 96.0000k -167.3281 4.3012n 177.8978
485 97.0000k -160.6924 9.2337n -163.5373
490 98.0000k -163.5840 6.6191n -119.5348
495 99.0000k -155.4378 16.9088n -136.2652
500 100.0000k -163.5663 6.6327n -144.3140
505 101.0000k -158.4360 11.9730n -137.7609
510 102.0000k -164.8759 5.7043n -179.9951
我該如何知道SFDR是多少?
定義是
無雜散動態範圍(SFDR)指載波頻率(最大信號成分)的RMS幅度與次最大噪聲成分或諧波失
真成分的RMS值之比，SFDR通常以dBc
看不太懂我該怎麼處理這串資料
另外想請問大家
老師出了一個SPEC說
SFDR 在Fin up to 10MHz時要大於65db
這樣是什麼意思呢?
我利用自己輸入的理想電壓源fft出來的結果有到102k的訊號
不太懂出來的資料表達的是什麼意思
上網查資料也看不太懂
拜託各位高手解答
謝謝
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