Version 4
SHEET 1 2244 2664
WIRE 544 -208 416 -208
WIRE -64 -144 -96 -144
WIRE 48 -144 -64 -144
WIRE -64 -128 -64 -144
WIRE 48 -112 48 -144
WIRE 176 -112 48 -112
WIRE 368 -64 352 -64
WIRE 1120 -48 688 -48
WIRE 176 -16 160 -16
WIRE 688 -16 688 -48
WIRE -464 0 -544 0
WIRE -464 16 -464 0
WIRE -48 16 -64 16
WIRE -288 32 -288 16
WIRE -64 32 -64 16
WIRE -464 112 -464 96
WIRE -464 160 -544 160
WIRE 720 160 704 160
WIRE 384 176 384 160
WIRE 544 176 544 -208
WIRE 544 176 448 176
WIRE 704 192 704 160
WIRE -464 208 -464 160
WIRE 176 272 128 272
WIRE -464 304 -464 288
WIRE 288 336 288 320
WIRE 288 336 256 336
WIRE -160 432 -160 208
WIRE 128 432 128 272
WIRE 128 432 112 432
WIRE -64 480 -80 480
WIRE 400 496 160 496
WIRE 160 528 160 496
WIRE 160 528 112 528
WIRE 208 528 160 528
FLAG -288 16 x_m
FLAG -160 208 H_m
FLAG -160 512 0
FLAG 368 -64 U_m
FLAG 448 176 b_m
FLAG -80 480 e_m
FLAG 416 -128 0
FLAG -288 112 0
FLAG 384 80 0
FLAG -544 160 Sig
IOPIN -544 160 In
FLAG 1120 -48 PDM
IOPIN 1120 -48 Out
FLAG 208 528 CLK
FLAG 704 272 0
FLAG 720 160 b_m-buf
FLAG -544 0 Start
IOPIN -544 0 In
FLAG -464 112 0
FLAG 160 -16 CLK
FLAG -64 -48 0
FLAG -96 -144 sum1
FLAG -64 112 0
FLAG -48 16 carry1
FLAG 288 240 0
FLAG 256 336 sum2
FLAG 384 176 ERR
FLAG 176 272 sum2
FLAG 480 496 0
FLAG 688 64 0
FLAG -464 304 0
SYMBOL bv -160 528 M180
WINDOW 0 -53 18 VRight 0
WINDOW 3 -168 -32 Left 0
SYMATTR InstName BuffError
SYMATTR Value V=delay(V(e_m),{Tbuf})
SYMBOL bv 416 -224 R0
WINDOW 3 148 411 VLeft 0
WINDOW 0 -39 -11 Left 0
SYMATTR Value V=if( V(U_m)>50&V(Carry1)>0,100,0 )
SYMATTR InstName BComparator
SYMBOL bv -288 16 R0
WINDOW 3 -47 218 VLeft 0
SYMATTR Value V=(if( V(Start)>0.5,{LEVEL},0 ))
SYMATTR InstName BLevel
SYMBOL bv 384 64 M0
WINDOW 3 -156 -17 Left 0
WINDOW 0 -98 53 Left 0
SYMATTR Value V=if( V(Carry1)>0,V(U_m),0 )
SYMATTR InstName BError
SYMBOL bv 704 176 R0
WINDOW 3 -54 137 Left 0
WINDOW 0 37 48 Left 0
SYMATTR Value V=if( V(U_m)>50&V(Carry1)>0,100,0 )
SYMATTR InstName Bout
SYMBOL res -480 0 R0
SYMATTR InstName R1
SYMATTR Value 1G
SYMBOL SpecialFunctions\\sample 256 -80 R0
WINDOW 3 -124 -105 Invisible 0
SYMATTR Value Vhigh=100 Vlow=-100
SYMATTR InstName A3
SYMBOL SpecialFunctions\\sample 32 464 M0
WINDOW 3 -89 -103 Invisible 0
SYMATTR Value Vhigh=100 Vlow=-100
SYMATTR InstName A6
SYMBOL bv -64 -144 R0
WINDOW 3 -105 132 Left 0
SYMATTR Value V=V(x_m)+V(H_m)
SYMATTR InstName B5
SYMBOL bv -64 16 R0
WINDOW 0 30 39 Left 0
WINDOW 3 -127 125 Left 0
SYMATTR InstName B7
SYMATTR Value V=abs( V(x_m)+V(H_m) )
SYMBOL bv 288 336 M180
WINDOW 0 24 104 Left 0
WINDOW 3 -107 -32 Left 0
SYMATTR InstName B8
SYMATTR Value V=V(ERR)+V(b_m)
SYMBOL bv 384 496 M90
WINDOW 0 -32 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName B_ddt_front
SYMATTR Value V=IF( ddt( v(sig) ) >0, 1, 0 )
SYMBOL bv 688 -32 R0
WINDOW 3 -50 -45 Left 0
WINDOW 0 37 48 Left 0
SYMATTR Value V=if( V(sig)>0.5&V(b_m-buf)>50,V(sig),0 )
SYMATTR InstName BCompBuff1
SYMBOL res -480 304 M180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 1g
TEXT -696 -88 Left 0 !.param LEVEL=95 Tbuf=2500n
TEXT 896 104 Left 0 ;OUTPUT STAGE
TEXT -64 -296 Left 0 ;THE ERROR DIFFUSION ALGORITM USED AS\n     PULSE DENSITY MODULATION ALGO
TEXT -104 -160 Left 0 ;ADDER BLOCK#1
TEXT 176 184 Left 0 ;ADDER BLOCK#2
TEXT -56 376 Left 0 ;Memory#2
TEXT 224 -184 Left 0 ;Memory#1
TEXT -696 -128 Left 0 ;SET LEVEL OF MODULATION
TEXT -520 -40 Left 0 ;INPUT STAGE
TEXT -320 -344 Left 0 ;Se for algo example http://www.ssau.ru/files/resources/npk2011.pdf p.250 Fig.1
RECTANGLE Normal 112 208 -192 -176
RECTANGLE Normal 464 160 160 400
RECTANGLE Normal 1072 352 640 -112
RECTANGLE Normal 128 576 -64 352
RECTANGLE Normal 352 16 160 -208
RECTANGLE Normal -368 320 -528 -64
RECTANGLE Normal 608 592 -352 -320