XPost: sci.electronics.design, sci.electronics.misc
From: presence@MUNGEpanix.com
In sci.electronics.design MrTallyman wrote:
> On Thu, 7 Mar 2013 07:14:39 +0000 (UTC), Cydrome Leader
> wrote:
>
>>In sci.electronics.misc Tim Williams wrote:
>>> Hmmm, not a big deal I suspect.
>>>
>>> Build a general purpose RF block for, say, 2.45GHz BT or 802.11(etc), or
>>> whatever. Give it handles to talk with anything (modulations, bit
>>> streams, etc.), design and build it on a particular fab process, and like
>>> magic, anything incorporating that block will also work. Monolithic
>>> inductors can be fabricated with not very good Q at 2.45GHz (I think they
>>> usually peak around Q = 10 or 20 around 5GHz), but enough to do "silicon
>>> oscillators" and stuff. Voltage regulation (bandgap, or old school buried
>>> zener) and temperature compensation are no-brainers, as ICs go. Want a
>>> DDS? Just chuck some more IP at it! Then whatever ancillary function
>>> (moisture, temperature sensor, etc.) simply plugs into this mess of
>>> transistors and functions.
>>>
>>> Quite crazy, as all that circuitry is squeezing into a few milimeters of
>>> silicon, when a few decades ago it was, well of course it was migrating to
>>> thick film before monolithic, but before that, it was all machined
>>> cavities, hand-soldered RF transistors, and microstrip everywhere. I
>>
>>years ago I was given a box of microwave "plumbing" from what may have
>>been a broadcast engineer. The stuff would have worked with microwaves or
>>hydraulic fluid. The guy who made the stuff seemed to be really good with
>>a jewelers saw, copper pipe, brass discs rods and solder.
>>
>>
>>
> Not many folks making hard coax runs anymore.
this stuff was pretty darn old.
are there power levels where they stil use wavegides and the like?
> Semi-rigid and a few others abound.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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