I am an EE graduate student at the University of Notre Dame, working on a project to develop a high-density array for brain imaging using diffuse optics (use lasers and SiPM as a photodetector, use frequency domain near-infrared spectroscopy). The project involves utilizing RF signals ranging from 50 to 400MHz, with a maximum power of -10dBm, and DC voltage max of 4V, and a current max of 50mA. RF and DC signals are combined using a bias tee for each laser employed in the design. There are multiple lasers of four wavelengths involved in the HD array. The bias tee includes a capacitor (4.7nF) to block DC from entering the RF switch (HMC253AQS24ETR) and an inductor (1008CS-102XJLC) to prevent RF from entering the DC switch. However, having an inductor for each laser makes the design bulky and not ideal for a wearable prototype.
I would like to inquire whether it's feasible to remove these inductors and connect only one at the DC input of the ADG5208 switch. Does the ADG5208 DC switch have sufficient resistance to block RF on its own?
Please reach out to me if need more information.
Here is the link to the schematic image: https://docs.google.com/drawings/d/1ZunQId1hY3qVM5CmbJGtFeE8OTHyrgYqi7TJWqEmVwU/edit
Thanks
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[edited by: GenevaCooper at 2:21 PM (GMT -5) on 6 Mar 2024]