We are using almost the same IC in our product, as a driver for a transmitting coil in industrial environment, for material test, and we had never ever fail one of those. Must be around 4k or 5k of those ICs we have out in the field, and the only failures were two or three that came dead from the PCB manufacturer. Even a hard short never was able to kill one.
Ralph. From: discuss-gnuradio-bounces+ralph=schmid....@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid....@gnu.org] On Behalf Of Marcus D. Leech Sent: Friday, January 16, 2015 8:12 PM To: khalid.el-darymli; Michael Rahaim Cc: Discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX On 01/16/2015 02:08 PM, khalid.el-darymli wrote: Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid Interesting. The driver chip that's used, as a unity-gain differential-to-single-ended driver, is, according to the datasheets, pretty robust. So, it would be interesting to know exactly what the failure mode is. On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim <mrah...@bu.edu <mailto:mrah...@bu.edu> > wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli <khalid.el-dary...@mun.ca <mailto:khalid.el-dary...@mun.ca> > wrote: >> Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude > 1, the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting -28.13dBm, much less than what you said, I am not sure, why? Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech <mle...@ripnet.com <mailto:mle...@ripnet.com> > wrote: Thanks Marcus for your reply. >> Probably somewhere in the neighborhood of +7dBm, maybe a little more. >> The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ +7dBm is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: "khalid.el-darymli" <khalid.el-dary...@mun.ca <mailto:khalid.el-dary...@mun.ca> > To: "Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> " <discuss-gnuradio@gnu.org <mailto:discuss-gnuradio@gnu.org> > Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: <CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com <mailto:wksequrcajrtuv5...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html> ------------------------------ Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: "Marcus D. Leech" <mle...@ripnet.com <mailto:mle...@ripnet.com> > To: discuss-gnuradio@gnu.org <mailto:discuss-gnuradio@gnu.org> Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: <54abe798.5060...@ripnet.com <mailto:54abe798.5060...@ripnet.com> > Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: > Hi, > > What is the maximum output power from the LFTX daughterboard when used > with the USRP N200? > > According to this datasheet [1], the N200 with the WBX daughterbaord > provide an output power of 15 dBm. However, when using the LFTX > daughterboard, I am getting a much less output power. > [1] > http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf > > In GNU Radio with the USRP N200, we use a sinusoid with a frequency of > 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for > a center frequency of 5 MHz. When the output of LFTX is plugged into a > scope terminated with a 50-ohm terminator, the scope reads 24.8 mV > (peak-to-peak). This is around -28.13 dBm. > > Is this the max power one can get out of the LFTX daughterboard? > > > Thanks. > > Best regards, > Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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