Nanosecond Duty cycle PWM generation
Nanosecond Duty cycle PWM generation
(OP)
Hello guys,
I am looking for simple methods of generating a square wave 5V with adjustable duty cycle of ATLEAST 50ns. Not too concerned about the switching frequency at the moment. The purpose is to suit pulsed power generation. Therefore a pulse repetition rate of 0.1-1Hz should be more than enough.
I am not convinced the conventional method of comparing a triangular wave with a reference would give me that precision. Any ideas would be highly appreciated.
Thanks
I am looking for simple methods of generating a square wave 5V with adjustable duty cycle of ATLEAST 50ns. Not too concerned about the switching frequency at the moment. The purpose is to suit pulsed power generation. Therefore a pulse repetition rate of 0.1-1Hz should be more than enough.
I am not convinced the conventional method of comparing a triangular wave with a reference would give me that precision. Any ideas would be highly appreciated.
Thanks





RE: Nanosecond Duty cycle PWM generation
RE: Nanosecond Duty cycle PWM generation
A one-instruction/Hz processor running at 20MHz would give you the resolution you ask for, and a 1-10Hz repetition rate would be easily achievable. Typical crystals give you 50ppm accuracy, and better can be achieved with MEMS oscillators.
It doesn't get any simpler than that. A PIC chip and supporting components could output a pulse like that for <$5 in single quantities.
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Nanosecond Duty cycle PWM generation
The method to use is the digital equivalent of the analog approach you have described.
RE: Nanosecond Duty cycle PWM generation
My circuit had four outputs, and was used to (crudely) microstep a stepping motor.
Mike Halloran
Pembroke Pines, FL, USA
RE: Nanosecond Duty cycle PWM generation
Keith Cress
kcress - http://www.flaminsystems.com
RE: Nanosecond Duty cycle PWM generation
RE: Nanosecond Duty cycle PWM generation
Mike Halloran
Pembroke Pines, FL, USA