CommonSorcerer
Newbie level 3
Hello,
I need to design a signal that is a square wave between 80-120 MHz that can have its duty cycle vary from 10-90%.
Initially, I was going with the LTC6905 to generate a 50% duty cycle, however, adjusting the duty cycle in a subsequent stage proved to be harder than just generating the appropriate waveform. I entertained the idea of using a 5th order chebyshev LP filter to get a sine wave and use a certain trigger level to set the duty cycle, but I can't find comparator IC's that work at such high frequencies.
I would like to adjust the frequency continuously (i.e. with a resistor) and have relatively coarse duty cycle steps (10% increments). I would also be fine with having discrete steps from a PLL. However, I have never used a PLL with a duty cycle other than 50%.
If anyone has some tips, or a suggestion for IC's that I can look into, it would be highly appreciated. Thank you for your time.
Kind Regards,
-Michael
I need to design a signal that is a square wave between 80-120 MHz that can have its duty cycle vary from 10-90%.
Initially, I was going with the LTC6905 to generate a 50% duty cycle, however, adjusting the duty cycle in a subsequent stage proved to be harder than just generating the appropriate waveform. I entertained the idea of using a 5th order chebyshev LP filter to get a sine wave and use a certain trigger level to set the duty cycle, but I can't find comparator IC's that work at such high frequencies.
I would like to adjust the frequency continuously (i.e. with a resistor) and have relatively coarse duty cycle steps (10% increments). I would also be fine with having discrete steps from a PLL. However, I have never used a PLL with a duty cycle other than 50%.
If anyone has some tips, or a suggestion for IC's that I can look into, it would be highly appreciated. Thank you for your time.
Kind Regards,
-Michael