Increasing Sensitivity (was Re: [MLB-WIRELESS] <PLUG> Cheap prices for wireless gear)

[Mike]

Cooling down the PA and LNA will actually make matters worse; the chips
are optimised at around room temperature usually. Most of these ICs are
rated from around 0-85 degrees. 

Look at some of the datasheets from Intersil & RFMD


-----Original Message-----
From: owner-melbwireless at wireless.org.au
[mailto:owner-melbwireless at wireless.org.au] On Behalf Of John Dalton
Sent: Thursday, 22 May 2003 10:36 AM
To: Drew
Cc: melbwireless at wireless.org.au
Subject: Re: Increasing Sensitivity (was Re: [MLB-WIRELESS] <PLUG> Cheap
prices for wireless gear)

The trick would be to try and get the cooling device
directly onto the Low Noise Amplifier of the receiver
(and maybe the stage after).  Given the small amount
of heat being pumped a Peltier should be able to cool
to quite a low temperature (dT~70C for a single stage?),
despite the low coefficient of performance associated
with large temperature differences.  Using a multi-stage
device might also help?

John


For interest:
0K = -273.15C
Liquid Nitrogen temerature = 77K = -196C

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