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Circuit Sim Lab (電路模擬實驗室)

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PCB calculators: trace impedance, crosstalk, diff skew, crystal load cap, Vout tolerance, inrush.

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Last Tested
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Streamable HTTP · MCP 2025-06-18
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Available Tools

6 tools
crosstalk串音(解析式:近端/遠端係數)Inspect

兩條耦合線的串音:偶/奇模阻抗用 2D 電場數值解,再算近端串音係數 kb、飽和比例、遠端串音係數。只回傳解析式的部分(不含工具頁的 ngspice 時域波形)。

ParametersJSON Schema
NameRequiredDescriptionDefault
hNo微帶線:線到參考層的介質厚度(kind=ms)(mm)
sNo差動對的線間距(單線 single 模式不用)(mm)
tNo銅厚(35 µm=1 oz)(mm)
wNo線寬(mm)
erNo板材介電常數 εr(帶狀線上下用同一個)
haNo帶狀線:線頂到上參考層(kind=sl)(mm)
hbNo帶狀線:線底到下參考層(kind=sl)(mm)
trNo攻擊線的上升時間(10–90%)(ps)
lenNo並行長度(mm)
kindNoms=微帶線(外層)、sl=帶狀線(內層,上下都有參考層)ms
diff_skew差動對對內 skewInspect

兩條線的長度差換成時間差(ps),對照介面規範的限制(USB3/PCIe/DisplayPort/HDMI,限制值附原廠文件出處)。

ParametersJSON Schema
NameRequiredDescriptionDefault
eeNo有效介電常數 εeff
lnNoN 線長度(mm)
lpNoP 線長度(mm)
rateNo資料速率(UI=1000÷速率 ps)(Gbps)
ifaceNo介面:none/usb3/pcie/dp/hdminone
impedance差動/單端阻抗(微帶線、帶狀線)Inspect

用 2D 電場數值解算微帶線或帶狀線的差動阻抗(Zdiff、Zcomm、奇/偶模)或單端阻抗(Z0),含銅厚。回傳附適用範圍。

ParametersJSON Schema
NameRequiredDescriptionDefault
hNo微帶線:線到參考層的介質厚度(kind=ms)(mm)
sNo差動對的線間距(單線 single 模式不用)(mm)
tNo銅厚(35 µm=1 oz)(mm)
wNo線寬(mm)
erNo板材介電常數 εr(帶狀線上下用同一個)
haNo帶狀線:線頂到上參考層(kind=sl)(mm)
hbNo帶狀線:線底到下參考層(kind=sl)(mm)
kindNoms=微帶線(外層)、sl=帶狀線(內層,上下都有參考層)ms
modeNodiff=差動對、single=單線diff
inrush_current湧入電流(負載開關控速/直接接電容)Inspect

負載開關控速上升時的充電電流、峰值電流、能量與脈衝 I²t(mode=slew),或電容直接接電源時的串聯 R-L-C 步階電流(mode=direct)。

ParametersJSON Schema
NameRequiredDescriptionDefault
ctNoCT 腳電容(ctsel≠none 時用)(pF)
lhNo線路電感(direct)(nH)
rlNo負載電阻(0=不接)(Ω)
rsNo線路+電源內阻(direct)(mΩ)
trNo輸出上升時間(10–90%,ctsel=none 時用)(µs)
esrNo電容 ESR(direct)(mΩ)
vinNo輸入電壓(V)
coutNo輸出電容(µF)
modeNoslew=負載開關控速、direct=直接接電容slew
ctselNo用 CT 腳電容決定上升時間:none/t918/t965none
output_voltage_tolerance輸出電壓公差(回授分壓)Inspect

回授電阻分壓的輸出電壓:最壞情況(每項取上下限的所有組合)、RSS 統計;可選蒙地卡羅超規比例。

ParametersJSON Schema
NameRequiredDescriptionDefault
nNo蒙地卡羅次數
dtNo溫差(°C)
r1No上電阻 R1(kΩ)
r2No下電阻 R2(kΩ)
tcNo電阻溫漂(ppm/°C)
trNo電阻公差 ±(%)
ifbNo回授腳偏壓電流(典型)(nA)
distNo蒙地卡羅的誤差分布normal
tifbNo回授腳偏壓電流(最大偏離)(nA)
trefNoVREF 精度 ±(%)
vmaxNo允許的輸出上限(V)
vminNo允許的輸出下限(V)
vrefNo參考電壓 VREF(V)
trackNo1=兩顆電阻溫漂同向(互相抵消)
monte_carloNotrue=多跑蒙地卡羅(固定亂數種子,可重現)
xtal_load_cap晶振負載電容與增益餘裕Inspect

外掛電容 C1、C2 與雜散電容算出實際負載電容 CL、頻率偏移 ppm、振盪增益餘裕、驅動功率,並給出剛好對上規格 CL 的電容值。

ParametersJSON Schema
NameRequiredDescriptionDefault
fNo晶振頻率(MHz)
c0No並聯電容 C0(pF)
c1No外掛電容 C1(pF)
c2No外掛電容 C2(pF)
cmNo動態電容 Cm(fF)
csNo雜散電容(腳位+走線)(pF)
gmNo晶片振盪器跨導 gm(mA/V)
clsNo晶振規格的負載電容 CL(pF)
esrNo等效串聯電阻 ESR(最大值)(Ω)
vppNoC1 那端的峰對峰電壓(算驅動功率用)(V)

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 6 tool updates
    • First observedcrosstalk
    • First observeddiff_skew
    • First observedimpedance
    • First observedinrush_current
    • First observedoutput_voltage_tolerance
    • First observedxtal_load_cap

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