PWM pulse widths, duty cycles and Freqs

[BowstringLakeDavid]

Can anyone clue me in as to what the minimum pulse width, maximum frequency, maximum and minimum duty cycle can be using Raspberry Pi B+ (I'm not interested in overclocking or anything like that)
Thank you
(if this isn't the right forum to ask please let me know where)

[joan]

That depends on how you want to generate the PWM. You will get more flexibilty if you generate your own PWM.

minimum pulse width: 8 nanoseconds
maximum frequency: 125 MHz
maximum and minimum dutycycle: arbitrary

[jdb]

If you (ab)use the PWM peripheral in serial output mode coupled with a cyclic DMA transfer, you effectively have an arbitrary waveform generator at any bandwidth up to ~100MHz.

Getting a GPIO pin to go that fast, however, is an entirely different kettle of fish.

[cyrano]

Can anyone clue me in as to what the minimum pulse width, maximum frequency, maximum and minimum duty cycle can be using Raspberry Pi B+ (I'm not interested in overclocking or anything like that)
Thank you
(if this isn't the right forum to ask please let me know where)

That depends entirely on your application. Driving a hefty AC/DC motor requires other settings than driving a servo, a stepper motor or some LED's.