.PS
# TTLnand.m4
cct_init(svg_font(sans-serif,11bp__,1bp__))
up_
Q3: bi_tr
"Q3" at Q3.E above ljust
dot(at Q3.C); reversed(`diode',up_ dimen_/2)
Q4: bi_tr with .E at Here
"Q4" at Q4.E above ljust
resistor(up_ dimen_ from Q4.C); rlabel(,`svg_norm(130 svg_ohm)')
V: dot
line left_ dimen_*0.75 from Q4.B; dot
line left_ dimen_*0.75 from Q3.B; dot
Q2: bi_tr(up_ Q4.B.y-Q3.B.y) with .E at Here
"Q2" at 1/2 between Q2.E and Q2.C ljust
resistor(from Q2.C to (Q2.C,V)); rlabel(,`svg_norm(1.6 k`'svg_ohm)'); dot
resistor(from Q2.E down_ dimen_); llabel(,`svg_norm(1 k`'svg_ohm)')
line to (Q4.E,Here)
G: dot
line to Q3.E
line left_ dimen_/4 from Q2.B
right_
Q1: bi_trans(,,BCdE2BU) with .C at Here
"Q1" at Q1.Bulk above rjust
resistor(up_ from Q1.B to (Q1.B,V)); rlabel(,svg_norm(4 k`'svg_ohm))
line to V
line left dimen_ from Q1.E2
X1: dot; "X1" wid 0.2 rjust above at last [].w
X2: dot(at (X1,Q3.C)); "X2" rjust at last [].w
AA: line invis right dimen_ from X2
line from X2 to Intersect_(AA,Q1.Em1) then to Q1.E1
X3: dot(at 2 between X1 and X2); "X3" rjust below at last [].w
AA: line invis right dimen_ from X3
line from X3 to Intersect_(AA,Q1.Em0) then to Q1.E0
W: X2+(dimen_/2,0)
N: V+(0,dimen_/4)
S: (N.x,N.y-2*(N.y-W.y))
line from V to 2 between V and N
Vcc:dot; "+5 svg_norm(V)" ljust at last [].e
line from G to (G,S)
ground
line from N to (W,N) then to (W,S) then to S
arc rad N.y-W.y ccw to N with .c at 1/2 between N and S
line right (N.y-S.y)/2+dimen_/2 from Q3.C
Z: dot
lw = 1.05
"svg_it(Z = X1 . X2 . X3)" wid lw ljust
line left lw*0.73 from last "".ne+(0,2*textoffset)
command "" # end font
.PE