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6AC7模型:
.SUBCKT 6AC7 1 4 2 3 ; P S G K
+ PARAMS: MU=49.9 EX=1.39 KG1=632 KP=162 KVB=8 VCT =0; KG2=415
+ CCG=11P CPG1=.015P CCP=5P RGI=2K
RE1 7 0 1MEG ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1 7 0 VALUE= ; E1 BREAKS UP LONG EQUATION FOR G1.
+{V(4,3)/KP*LOG(1+EXP((1/MU+(VCT+V(2,3))/V(4,3))*KP))}
G1 1 3 VALUE={limit((PWR(V(7),EX)+PWRS(V(7),EX))/KG1*1.57*ATAN(2*V(1,3)/(KVB*3.14159)),0,v(1,3)/3200)}
;change /710 to /670, change the slope
; added limit-better models lower plate voltage limit condion
G2 4 3 value= {(I(G1)*900/(V(1,3) +2800))}
RCP 1 3 1G ; FOR CONVERGENCE
C1 2 3 {CCG} ; CATHODE-GRID 1
C2 1 2 {CPG1} ; GRID 1-PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
R1 2 5 {RGI} ; FOR GRID CURRENT
D3 5 3 DX ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
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