Dear Marcus. Thank you for your answer.
Yes, I mean daughterboards, not USRP. I made an expression too short :) And I am happy to hear that I don't need to worry about what I've been concerning. Regards, Jeon. 2015-07-03 0:27 GMT+09:00 Marcus Müller <marcus.muel...@ettus.com>: > Hi Jeon, > > What I concern is, USRP can process bipolar signal, has a low noise > amplifier (LNA) and an ADC at the receiving end. > > That's not true. The USRP motherboard itself doesn't have an amplifier; > amplifiers are, if they exist, on the daughterboards. > The LFRX doesn't have an LNA -- it just has an OpAmp configured as a > voltage follower. > > I've heard that LNA and ADC take a heavy stress if they process a > unipolar, a DC biased signal > > The ADC doesn't mind static signals (in fact, signals are always presented > to the ADC as differential), and the OpAmp is speced to withstand any > signal within its input range. So you don't have to worry :) > > NRZ might be a good idea for other reasons, but these depend solely on > your application. > > Best regards, > Marcus > > PS: I'll try to locate your thread on usrp-users. Normally we strive to > not miss anything on that mailing list. > > > On 07/02/2015 05:03 PM, Jeon wrote: > > I am using LFTX and LFRX to transmit and receive data between two nodes. > > I am modulating a bit stream with on-off keying (OOK) in which bit 1 is > modulated into HIGH voltage and bit 0 is modulated into LOW voltage close > to zero. > > What I concern is, USRP can process bipolar signal, has a low noise > amplifier (LNA) and an ADC at the receiving end. I've heard that LNA and > ADC take a heavy stress if they process a unipolar, a DC biased signal.I > want the statement to be clear. I have a particular condition that I can't > make a transmitted signal a bipolar NRZ signal instead of OOK... > > PS. I make a thread in discuss-gnuradio since I've got no reply on > USRP-users several days or weeks ago (I don't remember exactly...). > > Regards, > Jeon. > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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