Thank you very much for your response. I want to apply 1MHz and 1V signals using a signal generator with a Minicircuit bias tee built into the eVNA.That's the whole point of the bias-T, you have a DC
port and an AC port and a combined port.
Now, the DC port is inductor blocked and the AC,
capacitor blocked. So you can't push DC into the
AC (SMA) port, and any AC that can get through
the DC port (solder posts?) will be limited to very
low frequencies.
You should be OK with 1MHz into the AC port, but
check the specs - economics tends to make products
segmented to frequency ranges, and your port
blocking cap with 50 ohms Zout makes you a high
pass filter, while big caps' ESL would impose an
upper end to useful frequency. So "horses for courses".
The Mini-Circuits T I have, is good for 0.1MHz to 6GHz
so would be fine.
I want to sweep the frequency from 300kHz to 6GHz by VNA.Which signal do you want to combine with 1 MHz signal? If it's higher frequency RF, you want a diplexer rather than a bias tee.
In this case, neither bias tee nor diplexer can work to add 1 MHz signal. A resistive "power divider" (6 dB coupler) would be my first approach.I want to sweep the frequency from 300kHz to 6GHz by VNA.
Thank you for the response, but I need to apply two inputs one from signal generator and one from VNA.In this case, neither bias tee nor diplexer can work to add 1 MHz signal. A resistive "power divider" (6 dB coupler) would be my first approach.
Thank you very much for your response. here is the schematic of the bias tee built in the VNA:Can you be more clear about -which- bias-T port you are
trying to inject to? As I mentioned, the "DC" port will attenuate
HF (the BW limits rated, are for the "RF" port to "Combined"
port path). The "RF" port I imagine would be the VNA "input"
if there's a bias-T front end.
Yout test instrument may have limitations which a standalone,
wide-BW biast-T "nugget" does not?
Unfortunately, there are no RF mixers in the wide range of frequencies.Now you are talking about modulation, previously it was about "applying a signal", respectively adding it to another signal. The latter problem was precisely answered in my previous post: use a coupler.
A bias tee can add signals with distinct frequency difference but not modulate one signal by another. This can be e.g. done by a balanced mixer.
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The video shows added signals, not modulation. So we are probably back to a coupler.
There are, but apparently you don't want a mixer.Unfortunately, there are no RF mixers in the wide range of frequencies.
What is your suggestion?y = x1 + x2 added signals
y = x1 * (a + x2) amplitude modulation
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There are, but apparently you don't want a mixer.
Do you think this model works?Use a resistive "power divider" (6 dB coupler) to add the signals. View attachment 181701
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View attachment 181702
It seems that the resistive power combiner sums the signals from each input port and deliver the resulting combined signal to the output port.Use a resistive "power divider" (6 dB coupler) to add the signals. View attachment 181701
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View attachment 181702
No idea what this means in technical terms.if yes it does not work for me because I need the apply of both signals separately into my device:
1v and 1mhz
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