SPWM SIGNAL GENERATOR
* FILE EE518_19.CIR
.PARAM f=60, PERIOD={1/f}, PERC={PERIOD/23}, Tr={PERC/2}, Tf={Tr}
vcar  4 0 PULSE(0V 10V 0s {Tr} {Tf} 1ns {PERC})
vb    2 0 PULSE(1V -1V {PERIOD/2} 1ns 1ns {PERIOD/2} {PERIOD})
Rb    2 0 1ohm
vsin  1 0 SIN(0V 9V 60Hz)
Rs    1 0 1ohm
Emult 3 0 POLY(2) (1,0) (2,0) 0 0 0 0 1 ; Multiplier: vb x vsin
Xcomp 4 3 15V -15V 5 0 LM111            ; Voltage comparator
Rf    5 0 1Kohm                         ; Low pass filter
Cf    5 0 0.0047uF
Eamp  6 0 5 0 650                       ; Using as amplifier
RL    6 0 10K                           ; Node 6 is output
.TRAN 5us 16.66666667ms
.LIB EVAL.LIB
.PROBE
.END