thanks for the input - i think you may have a point, because my losses are about 30-40dB, which must be lost between stage 1 and stage 2 - only 0.75" - but with 2 caps in series with the transmission line, and a couple of resistors/inductors/caps leading off sideways to ground - which are...
thanks for the compliment!
well my soldering technique is to reflow the non sensitive components - you will see they are not bad at all - no excess solder. The short circuit you point out is intentional - if you see the datasheet I hope you'll agree!
I spoke to the engineers at sirenza - the...
here's a closeup - again - the green wire is my attempt to locate the missing rf! you can see it's connected to the input side of the 2nd amp. I know rf doesn't like going round corners, but I have got signals this way in the past - my board losses are so large (30dB or more) that this...
here's a picture of the board in varying states of assembly, the relevant point is where you see the green wire attached to an SMA connector - which is my crude attempt to "sample" the rf power at the junction of the first and second stages of the amp. you can see the ros 2500 vco...
Hi there,
I have been assembling 2 stage amps using minicircuits VCOs (ROS 1700 and 2500) rf output to stage 1 sirenza SXA389BZ or SXB4089Z on .031"FR4 via 2oz microstrip, and stage 2 in the same way to SPB 2026Zs.
I've been following the sirenza datasheets very closely to get tracklengths...
