Version 4.1
SHEET 1 4292 4404
WIRE 304 544 208 544
WIRE 496 544 384 544
WIRE 528 544 496 544
WIRE 1056 544 528 544
WIRE 1168 544 1056 544
WIRE 1264 544 1168 544
WIRE -688 576 -784 576
WIRE -544 576 -688 576
WIRE 208 576 208 544
WIRE -784 592 -784 576
WIRE 528 672 528 544
WIRE 704 672 528 672
WIRE -784 688 -784 672
WIRE -592 688 -608 688
WIRE -544 688 -544 576
WIRE -544 688 -592 688
WIRE 528 688 528 672
WIRE 1056 704 1056 544
WIRE -608 720 -608 688
WIRE -592 720 -592 688
WIRE 208 720 208 656
WIRE 1168 720 1168 544
WIRE -640 736 -736 736
WIRE -448 752 -576 752
WIRE -192 752 -448 752
WIRE -640 768 -672 768
WIRE -192 768 -352 768
WIRE 80 768 -128 768
WIRE -352 784 -352 768
WIRE -192 784 -224 784
WIRE -224 800 -224 784
WIRE -192 800 -224 800
WIRE 352 800 288 800
WIRE 464 800 464 752
WIRE 464 800 432 800
WIRE 480 800 464 800
WIRE -736 816 -736 736
WIRE -624 816 -624 784
WIRE -624 816 -736 816
WIRE -608 816 -608 784
WIRE -608 816 -624 816
WIRE -592 816 -592 784
WIRE -592 816 -608 816
WIRE -224 816 -224 800
WIRE -192 816 -224 816
WIRE 528 816 528 768
WIRE -224 832 -224 816
WIRE -208 832 -224 832
WIRE -176 832 -176 816
WIRE -176 832 -208 832
WIRE 288 832 288 800
WIRE 480 832 480 800
WIRE 704 832 704 672
WIRE 1168 832 1168 784
WIRE -1264 864 -1344 864
WIRE -1168 864 -1264 864
WIRE -912 864 -1024 864
WIRE -672 864 -672 768
WIRE -672 864 -912 864
WIRE -1344 896 -1344 864
WIRE -352 912 -352 864
WIRE -272 912 -352 912
WIRE -208 912 -208 832
WIRE -208 912 -272 912
WIRE -272 928 -272 912
WIRE 528 928 528 896
WIRE 704 928 704 896
WIRE 704 928 528 928
WIRE 288 944 288 912
WIRE 480 944 480 880
WIRE 480 944 288 944
WIRE 528 944 528 928
WIRE 528 944 480 944
WIRE -1168 960 -1200 960
WIRE -592 960 -608 960
WIRE -544 960 -544 688
WIRE -544 960 -592 960
WIRE -608 976 -608 960
WIRE -592 976 -592 960
WIRE -1200 992 -1200 960
WIRE -672 992 -672 864
WIRE -640 992 -672 992
WIRE -1344 1008 -1344 976
WIRE -448 1008 -576 1008
WIRE -192 1008 -448 1008
WIRE -736 1024 -736 816
WIRE -640 1024 -736 1024
WIRE -192 1024 -352 1024
WIRE 80 1024 -128 1024
WIRE -192 1040 -224 1040
WIRE 528 1040 528 944
WIRE 592 1040 528 1040
WIRE 720 1040 592 1040
WIRE 832 1040 800 1040
WIRE 976 1040 912 1040
WIRE 1296 1040 976 1040
WIRE 1456 1040 1376 1040
WIRE -352 1056 -352 1024
WIRE -224 1056 -224 1040
WIRE -192 1056 -224 1056
WIRE -624 1072 -624 1040
WIRE -608 1072 -608 1040
WIRE -608 1072 -624 1072
WIRE -592 1072 -592 1040
WIRE -592 1072 -608 1072
WIRE -224 1072 -224 1056
WIRE -192 1072 -224 1072
WIRE -224 1088 -224 1072
WIRE -208 1088 -224 1088
WIRE -176 1088 -176 1072
WIRE -176 1088 -208 1088
WIRE -736 1104 -736 1024
WIRE -608 1104 -608 1072
WIRE -608 1104 -736 1104
WIRE 1056 1104 1056 784
WIRE 1120 1104 1056 1104
WIRE 1168 1104 1168 912
WIRE 1168 1104 1120 1104
WIRE -736 1120 -736 1104
WIRE 528 1168 528 1040
WIRE 656 1168 528 1168
WIRE 736 1168 656 1168
WIRE 832 1168 736 1168
WIRE -352 1200 -352 1136
WIRE -288 1200 -352 1200
WIRE -208 1200 -208 1088
WIRE -208 1200 -288 1200
WIRE 1168 1200 1168 1104
WIRE 1248 1200 1168 1200
WIRE 1392 1200 1312 1200
WIRE 1456 1200 1456 1040
WIRE 1456 1200 1392 1200
WIRE -288 1216 -288 1200
WIRE 528 1232 528 1168
WIRE 1056 1232 1056 1104
WIRE 1168 1232 1168 1200
WIRE 832 1280 832 1168
WIRE 736 1296 736 1168
WIRE 1168 1328 1168 1296
WIRE 368 1344 304 1344
WIRE 464 1344 464 1312
WIRE 464 1344 448 1344
WIRE 480 1344 464 1344
WIRE 656 1360 656 1168
WIRE 304 1376 304 1344
WIRE 528 1376 528 1312
WIRE 480 1392 480 1344
WIRE 832 1392 832 1360
WIRE 304 1488 304 1456
WIRE 480 1488 480 1440
WIRE 480 1488 304 1488
WIRE 528 1488 528 1456
WIRE 528 1488 480 1488
WIRE 608 1488 528 1488
WIRE 656 1488 656 1424
WIRE 656 1488 608 1488
WIRE 736 1488 736 1360
WIRE 736 1488 656 1488
WIRE 832 1488 832 1456
WIRE 832 1488 736 1488
WIRE 1056 1488 1056 1312
WIRE 1056 1488 832 1488
WIRE 1168 1488 1168 1408
WIRE 1168 1488 1056 1488
WIRE 1264 1488 1168 1488
WIRE 608 1552 608 1488
FLAG 208 720 0
FLAG 608 1552 0
FLAG 496 544 V_supply
FLAG 1392 1200 Cres
FLAG 592 1040 bridge_left
FLAG 976 1040 Lres
FLAG -736 1120 0
FLAG -784 688 0
FLAG -688 576 5V
FLAG -448 752 2
FLAG -448 1008 3
FLAG 464 752 upper_gate
FLAG 464 1312 lower_gate
FLAG 1120 1104 bridge_right
FLAG -1200 992 0
FLAG -912 864 test
FLAG -1344 1008 0
FLAG -1264 864 audio
FLAG 80 768 4
FLAG 80 1024 5
FLAG -272 928 0
FLAG -288 1216 0
SYMBOL sw 528 912 M180
WINDOW 3 -8 118 Left 2
SYMATTR Value Sw_kw1
SYMATTR InstName S1
SYMBOL sw 528 1472 M180
WINDOW 3 -22 120 Left 2
SYMATTR Value Sw_kw1
SYMATTR InstName S2
SYMBOL bv 288 816 R0
SYMATTR InstName B8
SYMATTR Value V=2*V(4)
SYMBOL bv 304 1360 R0
SYMATTR InstName B9
SYMATTR Value V=2*V(5)
SYMBOL res 448 784 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 2R2
SYMBOL res 464 1328 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 2R2
SYMBOL voltage 208 560 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -82 98 Left 2
SYMATTR InstName V6
SYMATTR Value PULSE(0 48 1u 10u 1 10 20)
SYMBOL res 400 528 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 1m
SYMBOL res 512 672 R0
SYMATTR InstName RS1
SYMATTR Value 1m
SYMBOL res 512 1216 R0
SYMATTR InstName RS2
SYMATTR Value 1m
SYMBOL res 816 1024 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rpri_sense
SYMATTR Value 1m
SYMBOL ind 704 1024 M90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L_res
SYMATTR Value 5µ
SYMATTR SpiceLine Rser=1m
SYMBOL cap 816 1392 R0
SYMATTR InstName C6
SYMATTR Value 100p
SYMBOL res 816 1264 R0
SYMATTR InstName R15
SYMATTR Value 1R
SYMBOL diode 720 896 R180
WINDOW 0 24 64 Left 2
WINDOW 3 -35 0 Left 2
SYMATTR InstName D3
SYMATTR Value pwr_diode
SYMBOL diode 672 1424 R180
WINDOW 0 24 64 Left 2
WINDOW 3 -35 0 Left 2
SYMATTR InstName D5
SYMATTR Value pwr_diode
SYMBOL cap 720 1296 R0
WINDOW 0 -27 4 Left 2
SYMATTR InstName C_bridge_1
SYMATTR Value 1f
SYMBOL cap 1152 720 R0
SYMATTR InstName C1
SYMATTR Value 470µ
SYMBOL cap 1152 1232 R0
SYMATTR InstName C2
SYMATTR Value 470µ
SYMBOL res 1040 688 R0
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL res 1040 1216 R0
SYMATTR InstName R8
SYMATTR Value 100k
SYMBOL res 1152 816 R0
SYMATTR InstName R10
SYMATTR Value 1m
SYMBOL res 1152 1312 R0
SYMATTR InstName R19
SYMATTR Value 1m
SYMBOL res 1392 1024 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_load
SYMATTR Value 5R
SYMBOL cap 1312 1184 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C_res
SYMATTR Value 1.5n
SYMBOL Comparators\\LT1719 -608 688 R0
SYMATTR InstName U1
SYMBOL Comparators\\LT1719 -608 944 R0
SYMATTR InstName U2
SYMBOL voltage -784 576 R0
SYMATTR InstName V1
SYMATTR Value 5V
SYMBOL SpecialFunctions\\modulate2 -1168 864 R0
WINDOW 3 5 154 Left 2
WINDOW 123 4 194 Left 2
SYMATTR Value mark=1.84E6+2.5E3
SYMATTR Value2 space=1.84E6-2.5E3
SYMATTR InstName A2
SYMBOL voltage -1344 880 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0.5 0.49 750)
SYMBOL bv -352 768 R0
WINDOW 3 -104 102 Left 2
SYMATTR Value V=delay(V(2), 15ns)
SYMATTR InstName B1
SYMBOL bv -352 1040 R0
WINDOW 3 -110 123 Left 2
SYMATTR Value V=delay(V(3), 15ns)
SYMATTR InstName B2
SYMBOL Digital\\and -160 720 R0
WINDOW 3 -96 17 Left 2
SYMATTR Value Vhigh=5
SYMATTR InstName A1
SYMBOL Digital\\and -160 976 R0
WINDOW 3 -104 7 Left 2
SYMATTR Value Vhigh=5
SYMATTR InstName A3
TEXT -1432 1392 Left 2 !.model pwr_diode D(Ron=1m Roff=1Meg Vfwd=.4)
TEXT -1320 1352 Left 2 !.tran 0 40m 10u 10n
TEXT -1432 1456 Left 2 !.model Sw_kw1 SW(Ron=.01 Roff=100Meg Vt=4 Vh=-1)
TEXT -1464 -72 Left 2 ;class D power amp FM, 1.84Mhz\n \nI want this to be narrowband FM rather thn wideband FM.\nnarrowband FM is defined as peak deviation is less than max audio freq.\namateurs often set max audio freq = about 3khz, so I will set peak deviation = 2.5khz.\nif the peak deviation was greater than the 3khz max audio freq , then this would be called wideband FM.\n \nIn the control circuit, the comparators on the left generate pulses that drive the high and low FETs.\nthere is then a circuit block that cuts 15ns off these pulses.\nthis is to ensure that both FETs are not on at once, this would generate a very high current that could \ngenerate EMI and even destroy the FETs.\n \nThe power circuit FETs are implemented as ideal switches S1 and S2 here,\nas complex circuits can have simulation issues\nthis circuit is open loop, that is it doesn't feed the output voltage back to the control circuit.\nthe power circuit components L_res and C_res have been selected to resonate at the 1.84 Mhz that the circuit is driven at.
TEXT 528 448 Left 4 ;Class D amplifier power circuit
TEXT 440 -136 Left 4 ;Instructions
TEXT -1456 -416 Left 5 ;Class D power Amp, set up as an FM amplifier.
TEXT -816 440 Left 4 ;Class D amplifier control circuit.
TEXT -376 560 Left 2 ;this circuit block is to \nshorten the drive pulses \nto stop "shoothrough"\nwhen both power switches \nare on at once.
TEXT 448 -80 Left 2 ;click on run\nthen click on "4" to plot it, then click on "5" to plot it.\nzoom in so that you can see the individual pulses.\nthen click on the plot window then on plot settings / add plot pane\nthen click on "bridge_left" to plot it, then click on "bridge_right" to plot it.\nthen click on the plot window and plot settings/add plot pane\nthen click on "R_load" to plot its current,\nthen click on the plot window and plot settings/add plot pane\nthen hold the ALT key hover over R-Load and click, \nthis will plot the power dissipated in it.\nclick on the plot window, then hold the cntrl key and click on the "V(Cres,Lres)*I(R_load)" title\nthis will bring up its average value (about 100W).\nallow nthe simulation to finish,\nclick on the plot window, then on view/FFT,\nin the window that opens click on I(R_load).\nin the graph that opens zoom to the 1.84 Mhz peak.
TEXT -1448 -168 Left 4 ;Circuit description.
TEXT -1448 -360 Left 3 ;The power circuit components L_res and C_res have been selected to resonate at the 1.84 Mhz that the circuit is driven at.\nHence this circuit is only designed for one band.\nfor a different band you would want different values of L_res and C_res, in fact you would want a complete new circuit to avoid the \nparasitics associated with switches.
TEXT -1312 440 Left 4 ;FM signal source
TEXT -1392 528 Left 3 ;Could be replaced with\neg a frequency modulated\nColpits oscillator.
RECTANGLE Normal 0 1280 -432 544 2
RECTANGLE Normal 48 1296 -864 480 2
RECTANGLE Normal 1488 1584 144 480 2
RECTANGLE Normal -896 1296 -1456 480 2