Version 4
SHEET 1 1660 680
WIRE -816 -464 -848 -464
WIRE -608 -464 -816 -464
WIRE 112 -464 -80 -464
WIRE 176 -464 112 -464
WIRE 416 -464 176 -464
WIRE -608 -448 -608 -464
WIRE -80 -416 -80 -464
WIRE 112 -416 112 -464
WIRE 416 -416 416 -464
WIRE -672 -400 -688 -400
WIRE -848 -384 -848 -464
WIRE 16 -368 -16 -368
WIRE 48 -368 16 -368
WIRE -688 -336 -688 -400
WIRE -608 -336 -608 -352
WIRE -608 -336 -688 -336
WIRE -608 -320 -608 -336
WIRE 416 -304 416 -336
WIRE 16 -288 16 -368
WIRE 64 -288 16 -288
WIRE 112 -288 112 -320
WIRE 112 -288 64 -288
WIRE -848 -272 -848 -304
WIRE -800 -272 -848 -272
WIRE -80 -272 -80 -320
WIRE -800 -256 -800 -272
WIRE -80 -256 -80 -272
WIRE 272 -256 -80 -256
WIRE 352 -256 272 -256
WIRE -848 -224 -848 -272
WIRE -608 -224 -608 -240
WIRE -608 -224 -688 -224
WIRE -608 -208 -608 -224
WIRE 272 -176 272 -256
WIRE 304 -176 272 -176
WIRE 416 -176 416 -208
WIRE 416 -176 368 -176
WIRE -688 -160 -688 -224
WIRE -672 -160 -688 -160
WIRE -80 -112 -80 -256
WIRE 112 -112 112 -288
WIRE -848 -96 -848 -144
WIRE -816 -96 -848 -96
WIRE -608 -96 -608 -112
WIRE -608 -96 -816 -96
WIRE -144 -64 -176 -64
WIRE 208 -64 176 -64
WIRE 224 -64 208 -64
WIRE -544 -32 -720 -32
WIRE -512 -32 -544 -32
WIRE 416 -32 416 -176
WIRE 448 -32 416 -32
WIRE 464 -32 448 -32
WIRE -512 16 -544 16
WIRE -592 32 -848 32
WIRE -80 32 -80 -16
WIRE 16 32 -80 32
WIRE 112 32 112 -16
WIRE 112 32 16 32
WIRE -720 64 -720 -32
WIRE -544 64 -544 16
WIRE -848 80 -848 32
WIRE -768 80 -848 80
WIRE -592 80 -592 32
WIRE 16 112 16 32
WIRE 416 112 416 -32
WIRE -48 160 -80 160
WIRE 352 160 -48 160
WIRE -720 176 -720 144
WIRE -672 176 -720 176
WIRE -624 176 -672 176
WIRE -544 176 -544 144
WIRE -544 176 -624 176
WIRE -848 208 -848 80
WIRE -672 208 -672 176
WIRE 16 224 16 208
WIRE 176 224 16 224
WIRE 416 224 416 208
WIRE 416 224 176 224
WIRE -848 336 -848 288
WIRE -768 336 -768 128
WIRE -768 336 -848 336
WIRE -688 336 -768 336
WIRE -672 336 -672 288
WIRE -672 336 -688 336
WIRE -592 336 -592 128
WIRE -592 336 -672 336
WIRE -688 352 -688 336
FLAG -800 -256 0
FLAG -816 -464 Vcc
FLAG -816 -96 Vee
FLAG 176 224 Vee
FLAG 448 -32 out
FLAG -176 -64 a
FLAG 208 -64 b
FLAG 176 -464 Vcc
FLAG -80 -272 x
FLAG 64 -288 y
FLAG -544 -32 a
FLAG -544 16 b
FLAG -688 352 0
FLAG -624 176 cm
FLAG 16 32 e
FLAG -80 160 biasn
FLAG -688 -400 biasp
FLAG -688 -224 biasn
SYMBOL npn -144 -112 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 176 -112 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL voltage -848 -400 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -848 -240 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL pnp 352 -208 M180
SYMATTR InstName Q6
SYMATTR Value 2N3906
SYMBOL res 400 -432 R0
SYMATTR InstName R6
SYMATTR Value 0
SYMBOL cap 368 -192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName Cc
SYMATTR Value {cc}
SYMBOL pnp 48 -320 M180
SYMATTR InstName Q4
SYMATTR Value 2N3906
SYMBOL pnp -16 -320 R180
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL e -720 48 R0
SYMATTR InstName E1
SYMATTR Value 0.5
SYMBOL e -544 48 R0
SYMATTR InstName E2
SYMATTR Value -0.5
SYMBOL voltage -672 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 0
SYMATTR InstName Vcm
SYMATTR Value 0
SYMBOL voltage -848 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName Vd
SYMATTR Value 0
SYMBOL npn -48 112 R0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL npn 352 112 R0
SYMATTR InstName Q7
SYMATTR Value 2N3904
SYMBOL npn -672 -208 R0
SYMATTR InstName Q8
SYMATTR Value 2N3904
SYMBOL current -608 -320 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Ibias
SYMATTR Value {ibias}
SYMBOL pnp -672 -352 M180
SYMATTR InstName Q9
SYMATTR Value 2N3906
TEXT 272 304 Left 2 !.meas DC vos find v(a) when v(out)=0\n.meas AC ft when mag(v(out))=1
TEXT -520 -48 Left 2 ;Va = Vcm + 0.5*Vd
TEXT -520 0 Left 2 ;Vb = Vcm - 0.5*Vd
TEXT -96 304 Left 2 !.ac dec 30 0.1 1G\n;dc Vd -10m 10m 1u
TEXT -224 -104 Left 2 ;in+
TEXT 184 -112 Left 2 ;in-
TEXT -96 432 Left 2 !;.step dec param Ibias 10u 10m 1
TEXT -384 312 Left 2 !.param cc=360p\n.param ibias=100u
TEXT -384 272 Left 4 ;Setup
TEXT -96 272 Left 4 ;Analysis
TEXT -96 400 Left 4 ;Variation
TEXT 272 272 Left 4 ;Measurements