raed_microwave
Advanced Member level 4
- Joined
- Jul 26, 2008
- Messages
- 107
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,296
- Location
- Kassel, Germany, Germany
- Activity points
- 2,066
E-design said:Post your proposed circuit, maybe then we can help
E-design said:It won't be a simple network. What sort of return loss can you accept?
E-design said:Is this just for a real application or just a theoretical exercise?
You may have to use multiple detectors and split the band in to a few sections.
You may then combine the output of the detectors.
If this is for a product design, then companies like AD make wide band detectors, which will be more cost effective in production.
E-design said:Look at this. Works up to 2.5GHz
https://www.analog.com/static/imported-files/data_sheets/AD8361.pdf
There is also an example to extend the range using a splitter.
Doing a match over such a wide band with discrete elements will result in something like a 7th order network, which will be difficult to replicate in manufacture due to component tolerances.
E-design said:There is another trick we can use. We apply a slight bias (20-60uA)current to the detector diode. That may result in an easier match.
E-design said:You can get better broadband matching when you use a 3dB coupler together with the detector diodes.
Plot below shows good return loss using this method, but with lower sensitivity of about 1.5mV/uW
E-design said:What is your lowest input threshold dBm or uW?
E-design said:You can get better broadband matching when you use a 3dB coupler together with the detector diodes.
Plot below shows good return loss using this method, but with lower sensitivity of about 1.5mV/uW
E-design said:The inductive and capacitive impedance's are about 1.414 times Zo. I started off with those values and fine tuned them as well as the termination for best return loss on the simulator.
E-design said:I extracted it and used it in my simulation. I include it here in Excel format
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?