Substitute for ADCH-80A rf choke

[Dragon88]

Hi,

Quick RF question. I have some spare Mini-Circuits Gali-52+ amps on hand from repairing a piece of equipment. I'd like to make a small general purpose LNA board with them. The reference design I have seen (and the thing I repaired) uses a Mini-Circuits ADCH-80A wideband choke for the bias to the amplifier. Unfortunately, the minimum quantity is 20 on Mini-Circuits website. I was hoping to find a cheaper alternative.

Is it possible to select a substitute fixed inductor and maintain the wideband nature of the circuit? The ADCH-80A is good for 50 MHz to 10 GHz. My application would be fine with 50MHz to 2 GHz. I understand SRF is a factor when selecting a choke for a specific frequency, but I'm not sure how to handle the wideband requirement.

Thanks!

[Dragon88]

Here's a sample of what I'm finding searching Digikey. An inductor with a SRF of 2.1GHz, but very low impedance at the low frequency of operation:

http://www.digikey.com/product-detail/en/LQW15AN91NG00D/490-6853-1-ND/3846050

Larger inductors of course have lower SRFs, but I need something closer to a uH to have a reasonable impedance at 50MHz. Should I just use both in series? Is that how the "wideband" rf chokes achieve their performance, or is it something more complicated?

[KJDS]

http://coilcraft.com/pdfs/bcr.pdf

[Dragon88]

Well that thing certainly looks cool.  But based on the theory of how it works, looks like I might be on the right track with multiple series inductors.