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RF choke replacement question

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Hawaslsh

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Hello,

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We were planning on using a particular amplifier which in turn requires a RF choak because the output is also the DC bias. In the dev board from minicircuits they use / recommend a particular RF choke they make.
Clearly they use that choke because they make it, but its entirely overkill for our situation (and over 3 bucks). We are operating at ~60 MHz, anyone see any pitfalls with replacing the choke with an inductor of equal value, but much less resonant frequency, 300 MHz or even as low as 150 MHz?
Something literally a tenth the price might work?

Thanks in advance
 

Choke = Inductor = Choke.

As long as the self resonant frequency is well away from the signal frequency you should be OK. The one on the development board was most likely picked because it was what they had to hand in the lab but that doesn't prevent other makes/types working equally well.

Brian.
 

If you need to amplify just a single fixed frequency, if the inductor is near to its resonant frequency you will have the minimum losses (parallel LC resonance). The same is valid for the decoupling capacitors in series with RF signal (series LC resonance).
In any case the inductor you selected is OK.
 

A Ferrite Bead from TDK may serve you for 60MHz.I used it for CATV Amplifier form 30 MHz up to 1218 MHz.
It's very cheap.
 

Hawaslsh said:
Clearly they use that choke because they make it
Click to expand...
I think you're being a little too cynical. For a dev board, it has to meet performance specs over its full rated bandwidth, and to do that a wideband choke is necessary. I'm betting if you called one of their engineers they would immediately agree with you and could recommend a cheap alternative.
 

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