Some vendors say "LF-1GHz" etc instead of the misleading "DC". True DC coupled amplifiers are a different universe. They must be differential. Search for differential amplifier IC'S from the usual suspects. You will find that the NF will be at least 7 dB and up. I'm not exactly sure why, but I have never seen an exception so it must be baked into the cake.
There are over-the-top bias TEE's that go from audio to GHz from extreme vendors such as Picosecond Pulse Labs. Again, those bias tees are a different universe than ordinary ones. Probably too pricey for hobby use. We used to have to mess around with all this stuff when I worked for Agilent Labs. Rick N6RK On 4/4/2020 3:02 AM, David C. Partridge wrote:
If you look at the way the power is supplied to and output is taken from an MMIC there's no way that I can see that they could go all the way to DC as there's always a capacitor in the output ... I got all excited a while back when I considered an MMIC for a project because the spec said DC-xGHz. Sadly the specified circuit for using it meant there's no way it could get the DC, though a large output capacitor in parallel with a RF cap would allow audio to GHz. Hmmm where did I leave the 1 MegaFarad capacitor. D.
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