Version 4 SHEET 1 2072 1036 WIRE -752 -32 -752 -64 WIRE -624 -32 -624 -64 WIRE -480 -32 -480 -64 WIRE 320 48 112 48 WIRE 1008 48 800 48 WIRE -752 80 -752 48 WIRE -624 80 -624 48 WIRE -480 80 -480 48 WIRE 192 144 192 128 WIRE 880 144 880 112 WIRE 112 160 112 48 WIRE 160 160 160 144 WIRE 160 160 112 160 WIRE 176 160 160 160 WIRE 800 160 800 48 WIRE 848 160 848 144 WIRE 848 160 800 160 WIRE 864 160 848 160 WIRE 320 176 320 48 WIRE 320 176 224 176 WIRE 1008 176 1008 48 WIRE 1008 176 912 176 WIRE -512 192 -576 192 WIRE -288 192 -304 192 WIRE -256 192 -288 192 WIRE -144 192 -176 192 WIRE -112 192 -144 192 WIRE 16 192 -32 192 WIRE 160 192 16 192 WIRE 176 192 160 192 WIRE 320 192 320 176 WIRE 384 192 320 192 WIRE 432 192 384 192 WIRE 544 192 512 192 WIRE 576 192 544 192 WIRE 704 192 656 192 WIRE 848 192 704 192 WIRE 864 192 848 192 WIRE 1008 192 1008 176 WIRE 1072 192 1008 192 WIRE 1104 192 1072 192 WIRE 160 208 160 192 WIRE 848 208 848 192 WIRE 16 224 16 192 WIRE 192 224 192 208 WIRE 704 224 704 192 WIRE 880 224 880 208 WIRE 16 304 16 288 WIRE 704 304 704 288 WIRE -576 320 -576 192 WIRE -144 384 -144 192 WIRE 160 384 -144 384 WIRE 320 384 320 192 WIRE 320 384 224 384 WIRE 544 384 544 192 WIRE 848 384 544 384 WIRE 1008 384 1008 192 WIRE 1008 384 912 384 WIRE -576 448 -576 400 FLAG 192 128 Vp FLAG 192 224 Vn FLAG 384 192 OUT1 IOPIN 384 192 Out FLAG -288 192 IN1 IOPIN -288 192 In FLAG 16 304 Vref FLAG 880 112 Vp FLAG 880 224 Vn FLAG 1072 192 OUT2 IOPIN 1072 192 Out FLAG 704 304 Vref FLAG -752 80 0 FLAG -624 80 0 FLAG -752 -64 Vp FLAG -624 -64 Vn FLAG -480 80 0 FLAG -480 -64 Vref FLAG -576 448 0 FLAG -512 192 IN1 IOPIN -512 192 Out SYMBOL res -16 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 249E3 SYMBOL res -160 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 7.5E3 SYMBOL cap 0 224 R0 SYMATTR InstName C1 SYMATTR Value 100E-12 SYMBOL cap 224 368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 1E-9 SYMBOL Opamps\\ADA4096 192 112 R0 SYMATTR InstName U1 SYMBOL res 672 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 113E3 SYMBOL res 528 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 15.4E3 SYMBOL cap 688 224 R0 SYMATTR InstName C3 SYMATTR Value 100E-12 SYMBOL cap 912 368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 1E-9 SYMBOL Opamps\\ADA4096 880 112 R0 SYMATTR InstName U2 SYMBOL voltage -752 -48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL voltage -624 -48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value -5 SYMBOL voltage -480 -48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 0 SYMBOL voltage -576 304 R0 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value2 AC 1 SYMATTR InstName VIN1 SYMATTR Value SINE(0 4.18 1E3) TEXT -136 496 Left 2 ;STAGE 1 Low Pass SallenKey with ADA4096 TEXT 568 496 Left 2 ;STAGE 2 Low Pass SallenKey with ADA4096 TEXT -600 624 Left 2 !.ac dec 100 1000 400000 TEXT -592 720 Left 2 ;.tf v(OUT2) VIN1\n.meas R_OUT_2 PARAM output_impedance_at_V(OUT2) TEXT -584 808 Left 2 ;.tf v(OUT1) VIN1\n.meas R_OUT_1 PARAM output_impedance_at_V(OUT1) TEXT 152 736 Left 2 ;Zout=V(output)/1A Diagramm oben rechteMaus-Taste [ V(out1)/1A ] links [Teilung Linear] TEXT 144 688 Left 2 ;Plot V(output)/1A to get the ouput impedance. TEXT -584 664 Left 2 ;.save V(*?*) I(*?*) TEXT 1224 -88 Left 2 ;https://www.mikrocontroller.net/topic/372194#new TEXT 152 -256 Left 2 ;Eingangswiderstand Sallen Key Tiefpass\nhttps://www.mikrocontroller.net/topic/474390#5845475 TEXT -80 0 Left 2 ;Stage B 2nd order Low-Pass Sallen Key TEXT 616 0 Left 2 ;Stage A 2nd order Low-Pass Sallen Key TEXT -104 -104 Left 2 ;https://www.analog.com/designtools/en/filterwizard/\nLow-Pass; 4th order Butterworth Bessel 0.6; 10kHz passband; Optimize: Power; +Vs: 5; -Vs: -5; GBW comp; R: 1%; C: 5%