Schottky Diode

Hi guys, I´m looking for a high speed schottky diode, had anybody made some experince with these.

Otherwise I´m not sure if these diodes fit to my needs. I like to convert a sawtooth signal to a square wave signal (round about 30MHz would be nice) . Are there other simple ways to realize or does anybody knows where to get such diodes with the appropriate properties?

Thank you !!!

Kohlmeise

You can use a comparator. For example

.1. On input V+ pin use your sawtooth signal .2. On input V- pin use a fixed voltage as threshold

The output of the comparator will be HIGH if the V+ > V - and LOW is V- > V +. So you will get a square signal on the same frequency as the sawtooth signal. The duty cycle (how much % is HIGH / LOW) can be adjusted by increasing/decreasing the voltage on your V- pin.

Good luck.

Hey calin ! Thanks for your promt reply, that sounds realy promising! I´ll try this soon.

But if there are more alternatives, please tell me !!! Iam very new on this field and not very familiar to many electrical components. So please help me to expand my electrical horizon :D

Thank you so much !

Are you really sure you mean 30 Mhz ? What is the application?

Yes I do. I build a some oscillating circuit which i would like to measure with the arduino DUE. 30MHz would be the optimal state .... 15MHz is also ok.

Sorry i forgot to mention that my output signal is already digital.... are there digital to digital converter?

You do not really have sawtooth signals at 30 MHz, nor do you have square waves - it's all about harmonics. Digital signals are already square waves, more or less but at 30 MHz, things are anything but "square".

I propose the universal question here - if you need help, please describe what you actually want to achieve?

kohlmeise: Hi guys, I´m looking for a high speed schottky diode, had anybody made some experince with these.

Otherwise I´m not sure if these diodes fit to my needs. I like to convert a sawtooth signal to a square wave signal (round about 30MHz would be nice) . Are there other simple ways to realize or does anybody knows where to get such diodes with the appropriate properties?

Thank you !!!

Kohlmeise

They don't make "low-speed" schottky diodes!

Without knowing what circuit you were contemplating its hard to say anything useful.

What is this sawtooth signal, voltage and impedance, what quality of square wave do you want from it (it does sound like a job for a high-speed comparator)?

High speed comparators are notoriously unstable and pretty much mandate a ground plane.

Its not impossible to have a good quality saw or square wave at 30MHz if you know what you are doing - which means using video amps and transmission line.

Are there other simple ways to realize or does anybody knows where to get such diodes with the appropriate properties?

If you're looking for ESD protection, the Due's internal series resistance is usually enough (but there's no internal protection diodes). I have considered using these (surface mount) for both ESD and 5V tolerance in another project.

kohlmeise: I build a some oscillating circuit which i would like to measure with the arduino DUE. 30MHz would be the optimal state .... 15MHz is also ok.

What is the 'it' you want to measure. If it is frequency I think you will struggle.

I am very new on this field and not very familiar to many electrical components.

So you will not know that 30MHz is a very high frequency for beginners to be playing about with. All sorts of other things affects your work at these frequencies and you will need to know a lot more than you do at the moment.