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PWM Signal Generator

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PCB.Engineer

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Please help me to design a PWM Signal Generator using a PIC16F887. The output frequency should be 100Hz-200KHz, Input Voltage is 5V-6.3V-Output 0-3.3V. I want to know if anybody has a idea using different method because I'm planning to use the PIC as the signal generator. Maybe using a separate PWM generator circuit controlled by PIC is one good idea but im having trouble in finding a circuit that will fit my specification. Maybe someone know an IC that can be used to perform this task. Thanks.
 
thank you for the reply. I already checked that data sheet. I want to know if it is possible to step the frequency by 1Hz starting from 100Hz using the PIC oscillator alone?
 
Do u mean a DC amplifier or a hi current supply>? Or perhaps a signal amplier ?

If it's under 20ma output drive I'd suggest using an opamp, for lower freq. u can go with an LM258/358 as those are single rail and will give u 3.3V out from a 5V supply. 200Khz should be ok for them, but check the spec sheet to be sure. Just setup the feedback to give u the 1:3.3 amplification.
If u are dealing with just the signal out, place a decoupling cap on the input & output. Perhaps a .1uf should work ok at those freq.
 
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