Krenzo
Newbie level 4
I'm working on a project that will use UWB pulses for time of flight applications. I was planning on using a step recovery diode as many papers discuss using a SRD circuit. However, SRDs are a little hard to come by (can't just order them from digikey), and so I'm starting to give thought to other ways to generate UWB pulses.
In my receiver, I was planning on using an ADCMP572 comparator from Analog Devices to detect when the UWB pulse arrives. It is able to detect a minimum input pulse of 80 ps and has a 35 ps output rise/fall time. Would it be possible to generate a UWB pulse by using this comparator in the transmitter? If I send a 10MHz pulse to the comparator's P input and a 100ps delayed version to the N input, I would have the comparator output high for just 100ps until the delayed pulse reaches N and sets the output low again.
It sounds like that would work, but the ADCMP572 outputs in CML. I'm not very familiar with CML. Can I just slap a capacitor at one of the CML outputs (which has a 400mV rise but it's centered around VCC) to get a positive AC pulse centered around GND and feed that into a differentiator (to get a monocycle) and then an amplifier and antenna for broadcasting?
Any advice or suggestions about UWB are appreciated.
In my receiver, I was planning on using an ADCMP572 comparator from Analog Devices to detect when the UWB pulse arrives. It is able to detect a minimum input pulse of 80 ps and has a 35 ps output rise/fall time. Would it be possible to generate a UWB pulse by using this comparator in the transmitter? If I send a 10MHz pulse to the comparator's P input and a 100ps delayed version to the N input, I would have the comparator output high for just 100ps until the delayed pulse reaches N and sets the output low again.
It sounds like that would work, but the ADCMP572 outputs in CML. I'm not very familiar with CML. Can I just slap a capacitor at one of the CML outputs (which has a 400mV rise but it's centered around VCC) to get a positive AC pulse centered around GND and feed that into a differentiator (to get a monocycle) and then an amplifier and antenna for broadcasting?
Any advice or suggestions about UWB are appreciated.