For a broad band, surface mount biasing inductor I use the Minicircuits
TCCH-80.
The pin 1 goes on the microstripline.
The pin out has to be looked at carefully because the connections as
viewed from the top and bottom do not connect straight through the multi
layer ceramic base.
John
[email protected] wrote:
Hi Bruce,
these are very nice indeed.
I used these conical inductors in our 2004 FireFox broad-band synthesizer
prototype (working from DC to 1.64GHz), they are quite amazing.
But:
* you need a microscope and a VERY stable hand to solder them down, and
cut-off the unused wire. I damaged quite a few before I figured out how to
solder them. And once soldered, they need to be physically protected because
they are so extremely fragile
* if I remember correctly they won't sell to everyone due to military
applications (their main use)
* their current handling capacity is limited
* And they are very expensive.
I ended up designing the FireFox with a series connected bias-t using a
120nH inductor in series to a 150 Ohm power resistor in series to a 2.2uH/270
Ohm resistor combination.
That works very well up to over 1.6GHz, and costs pennies compared to $$.
bye,
Said
In a message dated 10/8/2009 19:33:06 Pacific Daylight Time,
[email protected] writes:
For broadband use a powdered iron filled conical choke such as:
http://www.piconics.com/BC/bc.pdf
May be more useful, provided it is oriented correctly with respect to
the microstrip transmission line.
Bruce
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