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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] USRP Power Supply Noise |
Date: | Thu, 26 Aug 2010 14:03:26 -0700 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.11) Gecko/20100720 Fedora/3.0.6-1.fc12 Thunderbird/3.0.6 |
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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