 +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Software Libraries (/forum-10.html) +--- Forum: HP Prime Software Library (/forum-15.html) +--- Thread: Two Port Network Transistor Configuration Conversions (h-Parameter Conversions) (/thread-12663.html) Two Port Network Transistor Configuration Conversions (h-Parameter Conversions) - Eddie W. Shore - 03-22-2019 01:17 PM Introduction The program TRCONV converts h-parameter matrices for the following configurations of two-port networks: * Common Base Transistor Configuration (CB) * Common Emitter Transistor Configuration (CE) * Common Collector Transistor Configuration (CC) The h-parameter matrix, also known as a hybrid parameter, is a 2 x 2 matrix representation of a two port network. H = [ [ h11, h12 ] , [ h21, h22 ] ] where: [ [ V1 ], [ I2 ] ] = = [ [ h11, h12 ] , [ h21, h22 ] ] * [ [ I1 ], [ V2 ] ] The h-parameter matrix takes into account the short circuit condition (h11, h22) and the open circuit condition (h12, h21) in the two port network. The dimensions of the entries are: h11: input impedance, in ohms (Ω) h12: reverse voltage gain, dimensionless h21: forward current gain, dimensionless h22: output admittance, in seimens or mhos (1/Ω) The resulting matrix from TRCONV is known as a y-parameter matrix. HP Prime Program TRCONV Code: ```EXPORT TRCONV() BEGIN // 2019-03-10 // HP 67 LOCAL h11,h12,h21,h22; LOCAL y11,y12,y21,y22; LOCAL w1,w2,w3,w4,w5; LOCAL t,l; l:={"CE→CB","CB→CE","CC→CB", "CB→CC","CC→CE","CE→CC"}; INPUT( {{h11,[,]}, {h12,[,]}, {h21,[,]}, {h22,[,]}, {t,l}}, "TRANSISTOR CONVERSION", {"h11: ","h12: ","h21: ", "h22: ","Type:"} ); y11:=1/h11; y12:=−h12/h11; y21:=h21/h11; y22:=(h11*h22-h12*h21)/h11; MSGBOX([[y11,y12],[y21,y22]]); w1:=y11+y12+y21+y22; w2:=−(y12+y22); w3:=−(y21+y22); w4:=−(y11+y12); w5:=−(y11+y21); IF t==1 OR t==2 THEN RETURN [[w1,w2],[w3,y11]]; END; IF t==3 THEN RETURN [[y22,w3],[w2,w1]]; END; IF t==4 THEN RETURN [[w1,w5],[w4,y11]]; END; IF t==5 OR t==6 THEN RETURN [[y11,w4],[w5,w1]]; END; END;``` Example: H = [ [ 150, 0.003 ], [ 68, 0.007 ] ] CE → CB: [ [ 0.46562, -0.00562 ], [ -0.458973333333, 6.666666667E-3 ] ] CC → CE: [ [ 6.666666667E-3, -6.646666667E-3 ], [ -0.46, 0.46562 ] ] [conversion example] Source: "5. Transistors Configuration Conversion" HP 67-97 E.E. Pac I. Hewlett Packard. 1976 "h Parameter or Hybrid Parameter of Two Port Network" Electrical Concepts. 2019 https://electricalbaba.com/h-parameter-hybrid-parameter-two-port-network/ Retrieved March 21, 2019 Blog Spot: https://edspi31415.blogspot.com/2019/03/hp-prime-two-port-network-transistor.html RE: Two Port Network Transistor Configuration Conversions (h-Parameter Conversions) - KeithB - 03-22-2019 09:17 PM Thanks Eddie. But I believe h-parameters and y-parameters are only of academic interest now. It is either SPICE models or S-parameters. (People into noise calculations might still use y-parameters, so I may be off-base here) RE: Two Port Network Transistor Configuration Conversions (h-Parameter Conversions) - Eddie W. Shore - 03-23-2019 02:47 PM Good to know Keith, thank you.