Version 4
SHEET 1 2332 688
WIRE 160 -1136 160 -1152
WIRE 160 -1024 160 -1056
WIRE 256 -1024 160 -1024
WIRE 336 -1024 256 -1024
WIRE 368 -1024 336 -1024
WIRE 464 -1024 448 -1024
WIRE 560 -1024 544 -1024
WIRE 656 -1024 640 -1024
WIRE 928 -1024 912 -1024
WIRE 1024 -1024 1008 -1024
WIRE 1040 -1024 1024 -1024
WIRE 1168 -1024 1136 -1024
WIRE 1312 -1024 1296 -1024
WIRE 1408 -1024 1392 -1024
WIRE 1424 -1024 1408 -1024
WIRE 1552 -1024 1520 -1024
WIRE 1696 -1024 1680 -1024
WIRE 1792 -1024 1776 -1024
WIRE 1808 -1024 1792 -1024
WIRE 1952 -1024 1904 -1024
WIRE 256 -1008 256 -1024
WIRE 1040 -992 1024 -992
WIRE 1424 -992 1408 -992
WIRE 1808 -992 1792 -992
WIRE 256 -928 256 -944
WIRE 384 -864 384 -976
WIRE 400 -864 384 -864
WIRE 512 -864 480 -864
WIRE 544 -864 512 -864
WIRE 752 -864 688 -864
WIRE 928 -848 912 -848
WIRE 1024 -848 1008 -848
WIRE 1040 -848 1024 -848
WIRE 1168 -848 1136 -848
WIRE 1312 -848 1296 -848
WIRE 1408 -848 1392 -848
WIRE 1424 -848 1408 -848
WIRE 1552 -848 1520 -848
WIRE 1696 -848 1680 -848
WIRE 1792 -848 1776 -848
WIRE 1808 -848 1792 -848
WIRE 1952 -848 1904 -848
WIRE 160 -832 160 -1024
WIRE 208 -832 160 -832
WIRE 336 -832 304 -832
WIRE 384 -832 384 -864
WIRE 384 -832 336 -832
WIRE 1040 -816 1024 -816
WIRE 1424 -816 1408 -816
WIRE 1808 -816 1792 -816
WIRE 208 -800 160 -800
WIRE 512 -800 512 -864
WIRE 512 -800 448 -800
WIRE 544 -800 512 -800
WIRE 736 -800 688 -800
WIRE 752 -800 736 -800
WIRE 400 -784 384 -784
WIRE 992 -736 960 -736
WIRE 1088 -736 1040 -736
WIRE 1136 -736 1088 -736
WIRE 1328 -736 1312 -736
WIRE 1376 -736 1328 -736
WIRE 1472 -736 1424 -736
WIRE 1520 -736 1472 -736
WIRE 1760 -736 1728 -736
WIRE 1904 -736 1808 -736
WIRE 1952 -736 1904 -736
WIRE 1040 -720 1040 -736
WIRE 1136 -720 1136 -736
WIRE 1328 -720 1328 -736
WIRE 1424 -720 1424 -736
WIRE 1520 -720 1520 -736
WIRE 1808 -720 1808 -736
WIRE 1904 -720 1904 -736
WIRE 400 -704 400 -736
WIRE 448 -704 448 -720
WIRE 992 -704 992 -736
WIRE 1376 -704 1376 -736
WIRE 1760 -704 1760 -736
WIRE 160 -624 160 -800
WIRE 192 -624 160 -624
WIRE 224 -624 192 -624
WIRE 992 -624 992 -656
WIRE 1040 -624 1040 -640
WIRE 1136 -624 1136 -656
WIRE 1328 -624 1328 -640
WIRE 1328 -624 1312 -624
WIRE 1376 -624 1376 -656
WIRE 1424 -624 1424 -640
WIRE 1520 -624 1520 -656
WIRE 1760 -624 1760 -656
WIRE 1808 -624 1808 -640
WIRE 1904 -624 1904 -656
WIRE 336 -608 288 -608
WIRE 384 -608 336 -608
WIRE 496 -608 448 -608
WIRE 560 -608 496 -608
WIRE 736 -608 736 -800
WIRE 736 -608 624 -608
WIRE 192 -592 176 -592
WIRE 224 -592 192 -592
WIRE 560 -512 544 -512
WIRE 656 -512 640 -512
FLAG 336 -1024 f+1
FLAG 912 -848 0
FLAG 1024 -1024 3
FLAG 1168 -848 Da
FLAG 336 -608 clk
FLAG 912 -1024 0
FLAG 1024 -848 4
FLAG 1168 -1024 Qa
FLAG 1024 -992 clk
FLAG 1024 -816 clk
FLAG 464 -1024 0
FLAG 256 -928 0
FLAG 1296 -848 0
FLAG 1408 -1024 5
FLAG 1552 -848 Db
FLAG 1296 -1024 0
FLAG 1408 -848 6
FLAG 1552 -1024 Qb
FLAG 1408 -992 clk
FLAG 1408 -816 clk
FLAG 960 -736 a
IOPIN 960 -736 In
FLAG 336 -832 f
FLAG 192 -624 r
FLAG 656 -1024 win
FLAG 544 -1024 0
FLAG 656 -512 0
FLAG 544 -512 cy
FLAG 448 -704 0
FLAG 400 -704 0
FLAG 432 -976 0
FLAG 512 -864 fc
FLAG 1312 -624 c
IOPIN 1312 -624 In
FLAG 1040 -624 0
FLAG 1136 -624 0
FLAG 992 -624 0
FLAG 1088 -736 Ca
FLAG 1312 -736 b
IOPIN 1312 -736 In
FLAG 1424 -624 0
FLAG 1520 -624 0
FLAG 1376 -624 0
FLAG 1472 -736 Cb
FLAG 1792 -1024 m
FLAG 1952 -1024 mag
IOPIN 1952 -1024 Out
FLAG 1680 -1024 0
FLAG 1792 -848 p
FLAG 1952 -848 pha
IOPIN 1952 -848 Out
FLAG 1680 -848 0
FLAG 1792 -816 _r
FLAG 1952 -736 freq
IOPIN 1952 -736 Out
FLAG 1792 -992 _r
FLAG 192 -592 _r
FLAG 1728 -736 f
FLAG 1808 -624 0
FLAG 1904 -624 0
FLAG 1760 -624 0
FLAG 496 -608 sqr
FLAG 752 -864 Q
FLAG 752 -800 D
FLAG 160 -1152 0
FLAG 384 -784 freq
SYMBOL current 160 -1136 R0
WINDOW 0 16 80 Left 0
WINDOW 3 16 0 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value PULSE({f1} 0 {tstart+10n} 10n)
SYMBOL cap 240 -1008 R0
WINDOW 0 8 8 Right 0
WINDOW 3 24 56 Left 0
WINDOW 39 24 8 Left 0
WINDOW 123 8 56 Right 0
SYMATTR InstName C1
SYMATTR Value {1/f2/10}
SYMATTR SpiceLine Rpar=1
SYMATTR Value2 ic={f1}
SYMBOL g 352 -1024 R270
WINDOW 0 48 32 VLeft 0
WINDOW 3 48 80 VRight 0
SYMATTR InstName G1
SYMATTR Value {inc}
SYMBOL bi 560 -1024 R270
WINDOW 0 -35 40 VBottom 0
WINDOW 3 80 40 VCenter 0
WINDOW 123 48 40 VCenter 0
SYMATTR InstName B1
SYMATTR Value I=sin(pi*sdt(V(f)/round(V(cy)*{1-du}),0,V(r)))
SYMATTR Value2 Rpar=1 nojacob
SYMBOL S&H 256 -832 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co} Rout={Ro}
SYMATTR InstName A1
SYMBOL res 496 -880 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL sw 448 -704 M180
WINDOW 0 32 80 Left 0
WINDOW 3 16 16 Left 0
SYMATTR InstName S1
SYMATTR Value cbar
SYMBOL SpecialFunctions\\modulate2 544 -864 R0
WINDOW 3 0 112 Left 0
WINDOW 123 0 136 Left 0
WINDOW 0 0 -46 Left 0
SYMATTR Value space=0 mark=1
SYMATTR Value2 Vhigh=1 Vlow=-1
SYMATTR InstName A2
SYMBOL Digital\\buf1 624 -672 M0
WINDOW 3 16 80 Top 0
WINDOW 0 16 48 Bottom 0
SYMATTR Value Ref=0
SYMATTR InstName A3
SYMATTR Value2 tripdt={tdt}
SYMBOL Digital\\buf1 448 -672 M0
WINDOW 3 16 88 Top 0
WINDOW 0 16 48 Bottom 0
WINDOW 38 16 24 Bottom 0
WINDOW 123 16 120 Top 0
SYMATTR Value duty={du}
SYMATTR InstName A4
SYMATTR SpiceModel Counter
SYMATTR Value2 cycles=V(cy)
SYMBOL Digital\\buf 288 -672 M0
WINDOW 0 32 32 Bottom 0
WINDOW 3 32 96 Top 0
SYMATTR InstName A5
SYMATTR Value td=5n
SYMATTR Value2 tripdt={tdt}
SYMBOL bi 640 -512 M270
WINDOW 0 32 64 VRight 0
WINDOW 3 -32 112 VBottom 0
WINDOW 123 32 16 VLeft 0
SYMATTR InstName B2
SYMATTR Value I=u(time-Tstart)*round(limit(cy,cy*25,25*abs(V(f)/(fs-V(f)))**.5))
SYMATTR Value2 Rpar=1
SYMBOL bi 928 -1024 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B3
SYMATTR Value I=sdt(V(win)*V(Ca,a)*V(q),0,V(r))
SYMATTR Value2 Rpar=1
SYMATTR SpiceLine nojacob
SYMBOL S&H 1088 -1024 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A6
SYMBOL bi 928 -848 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B4
SYMATTR Value I=sdt(V(win)*V(a,Ca)*V(d),0,V(r))
SYMATTR Value2 Rpar=1
SYMATTR SpiceLine nojacob
SYMBOL S&H 1088 -848 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A7
SYMBOL g 1040 -736 R0
WINDOW 0 32 24 Left 0
WINDOW 3 32 88 Left 0
SYMATTR InstName Ga
SYMATTR Value 1
SYMBOL cap 1120 -720 R0
WINDOW 3 24 56 Left 0
WINDOW 39 24 80 Left 0
SYMATTR Value {Cx}
SYMATTR SpiceLine Rpar=1
SYMATTR InstName Ca
SYMBOL bi 1312 -1024 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B5
SYMATTR Value I=sdt(V(win)*V(Cb,b)*V(q),0,V(r))
SYMATTR Value2 Rpar=1
SYMATTR SpiceLine nojacob
SYMBOL S&H 1472 -1024 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A8
SYMBOL bi 1312 -848 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B6
SYMATTR Value I=sdt(V(win)*V(b,Cb)*V(d),0,V(r))
SYMATTR Value2 Rpar=1
SYMATTR SpiceLine nojacob
SYMBOL S&H 1472 -848 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A9
SYMBOL bv 1328 -736 M0
WINDOW 0 34 56 Left 0
WINDOW 3 0 -24 Center 0
SYMATTR InstName Bb
SYMATTR Value V=V(d)/V(fc)*Kt
SYMBOL g 1424 -736 R0
WINDOW 0 32 24 Left 0
WINDOW 3 32 88 Left 0
SYMATTR InstName Gb
SYMATTR Value 1
SYMBOL cap 1504 -720 R0
WINDOW 3 24 56 Left 0
WINDOW 39 24 80 Left 0
SYMATTR Value {Cx}
SYMATTR SpiceLine Rpar=1
SYMATTR InstName Cb
SYMBOL bi 1696 -1024 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B7
SYMATTR Value I=log10((V(Da)**2+V(Qa)**2)/(V(Db)**2+V(Qb)**2))
SYMATTR Value2 Rpar=10
SYMATTR SpiceLine nojacob
SYMBOL S&H 1856 -1024 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A10
SYMBOL bi 1696 -848 R270
WINDOW 0 40 -32 VRight 0
WINDOW 3 88 -32 VRight 0
WINDOW 123 64 -32 VRight 0
WINDOW 39 -48 -32 VRight 0
SYMATTR InstName B8
SYMATTR Value I=atan2(V(Qa),V(Da))-atan2(V(Qb),V(Db))
SYMATTR Value2 Rpar={180/pi}
SYMATTR SpiceLine nojacob
SYMBOL S&H 1856 -848 R0
WINDOW 3 0 48 Invisible 0
SYMATTR Value Vhigh={Vo} Vlow={-Vo} tripdt={tdt} Cout={Co}
SYMATTR InstName A11
SYMBOL g 1808 -736 R0
WINDOW 0 32 24 Left 0
WINDOW 3 0 -16 Center 0
SYMATTR InstName Gf
SYMATTR Value {inc**-1.6}
SYMBOL cap 1888 -720 R0
WINDOW 3 24 56 Left 0
WINDOW 39 24 80 Left 0
SYMATTR Value 10n
SYMATTR SpiceLine Rpar=1
SYMATTR InstName Cf
TEXT 256 -672 Bottom 0 ;Delayed\nIntegrator\nReset
TEXT 1144 -384 Left 0 !.param tdt=1n du=0.2\n+ Vo=2*f2 Ro=1 Co=0n1
TEXT 1136 -424 Left 0 ;S/H & other parameters
TEXT 480 -952 Left 0 ;DFT window generator (sine)
TEXT 920 -528 Left 0 !C3 3 0 10n\nC4 4 0 10n\nC5 5 0 10n\nC6 6 0 10n\nCm m 0 1n0\nCp p 0 159p\nCw win 0 10n\nCy cy 0 10n
TEXT 1144 -320 Left 0 !.model cbar sw Ron=1m\n+ Vt={0.4*f2} Vh={0.6*f2}
TEXT 688 -512 Left 0 ;DFT cycle count
TEXT 896 -576 Left 0 ;Convergence aids
TEXT 1192 -1224 Center 0 ;Time Domain Frequency Response Analyzer\nby analogspiceman 2010\n(requires this file, FRA-as.asc, two symbol files, FRA-as.asy, S&H.asy, and a top level schematic)
TEXT 1144 -536 Left 0 !.param\n+ inc=(f2/f1)**(1/pts)\n+ Cx=10/(2*pi*f1)
TEXT 1136 -576 Left 0 ;FRA derived parameters
TEXT 1472 -344 Left 0 ;.param f1=1k f2=100k fs=1G Kt=0.1 pts=500 cy=5 tstart=.1 trun=1\n.options plotwinsize=50k reltol=300u trtol=6\n.tran 0 {tstart+trun} {tstart+2*cy/f1} uic
TEXT 1472 -576 Left 0 ;The following parameters must be defined in the Main Schematic:\n+ f1, f2 ; start and stop frequency for the FRA sweep\n+ fs ; switching frequency of the SMPS being analyzed\n+ Kt ; amplitude (peak) of test signal between b and c\n+ pts ; frequency points between f1 and f2\n+ cy ; nominal integration cycles per DFT point\n+ tstart ; settling time delay to start of FRA\n+ trun ; FRA worst case run time (set >> than actual)
TEXT 160 -400 Left 0 ;To view output data in pseudo-frequency format, change the \nhorizontal axis quantity plotted to V(freq)/1V*1Hz, change the \nhorizontal scale to logarithmic and set the axis limits to f1 and f2. \nTo display the correct format for vertical axis units, change traces\nplotted to V(mag)/1V and V(pha)/1V*1deg.