On 08/24/2010 07:32 AM, Jeffrey Lambert wrote:
Hello,
I am attempting to build an analog front-end to a USRP 1 device. I have
selected a VCO that will suit the frequency range we are looking at: It
is an RFVC1800 and has a tuning range of approximately 7.4 - 12.4 GHz
over a 13 volt tuning voltage. As this VCO is very sensitive to external
noise, some power filtering will be necessary to minimize jitter and
phase noise. What I would like to know is whether or not there are any
other adverse effects from using the simple switch mode supply that is
included with the USRP?
Thanks,
~Jeffrey Lambert
The 6V supply on the daughterboards is filtered, but it is still
unregulated, so it will rise and fall between 5.8 and 6.4V with load
changes. You'll want to pass it through an LDO to use it.
You mention 13V, which will take a switcher to boost the 6V. In that
case, you can use the 6V directly into your switcher, which should then
be followed by an LDO to your final voltage.
Matt
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