70MHz peak detector/amplitude detector

[itayd100]

Hey E-design,

First, I appreciate your help!
I built the circuit on a proto-board with 2 BAT54WT1G (see the pic).
I see that you got a good result, I'll try to see if I did a mistake. Anyway, I'll order it on a PCB.

Second, I tried to connect it to HCMOS clock 66.66 MHz with 3Vpp and get the amplitude, but I get weird results. The Vpp of the peak detector getting (much) bigger. Do you have any idea? (or it is just me ;-) )


BAT54:
https://nl.farnell.com/on-semicondu...categorieën&categoryNameResp=Alle+categorieën

HCMOS:
https://www.farnell.com/datasheets/75480.pdf

 

[E-design]

I would suggest that you construct it with RF in mind. That will be short tight connections with a good ground plane to minimize unwanted stray capacitance and inductance's. Look at this paper and note construction techniques on pg 17.

You used a BAT54S, but the idea was to use the **broken link removed**, which share two devices with a common anode in one package.

 

[itayd100]

Hey E-design,

I used the BAT54S because that's what I had. Shouldn't be a problem in the circuit, no?
Thanks for the book. I'm learning....
Can you upload a picture of your board?