levnu
Full Member level 2
Hi
i'm trying to measure w/ Scope a fast differential signals (100MHz, 0.3V, Vcm = 1V) without loading them by the scope input - means
that when i connect to a scope and set it to 50ohm i loss 6dB and when i set to 1 MOhm input i get impedance mismatch and its bad
i thought about next solution do you think its possible under such conditions?
![IN-Amp solution.PNG IN-Amp solution.PNG](https://www.edaboard.com/data/attachments/46/46599-87fc4fca6d5570fbe040cbe7b217c14c.jpg)
So now I'm looking for Instrumentation Amplifier w/ next specification (and it seems impossible to find):
- Can operate w/ signals up to 500MHz
- Small signal AC is up to 0.5V @ 100MHz
- the small signal is riding on a DC V common mode of about 1V
- The required Gain is about A=2 (linear)
- Differential input single ended output (as standard for In-amps)
- is it possible to find such In-amp? if not what can i do? how can i reject the V common-mode and extract the ac
w/o using any capacitors or things like that...\
- Maybe some transformer?
i'm trying to measure w/ Scope a fast differential signals (100MHz, 0.3V, Vcm = 1V) without loading them by the scope input - means
that when i connect to a scope and set it to 50ohm i loss 6dB and when i set to 1 MOhm input i get impedance mismatch and its bad
i thought about next solution do you think its possible under such conditions?
![IN-Amp solution.PNG IN-Amp solution.PNG](https://www.edaboard.com/data/attachments/46/46599-87fc4fca6d5570fbe040cbe7b217c14c.jpg)
So now I'm looking for Instrumentation Amplifier w/ next specification (and it seems impossible to find):
- Can operate w/ signals up to 500MHz
- Small signal AC is up to 0.5V @ 100MHz
- the small signal is riding on a DC V common mode of about 1V
- The required Gain is about A=2 (linear)
- Differential input single ended output (as standard for In-amps)
- is it possible to find such In-amp? if not what can i do? how can i reject the V common-mode and extract the ac
w/o using any capacitors or things like that...\
- Maybe some transformer?