xc6lx45

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xc6lx45 last won the day on February 24

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About xc6lx45

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    RF / DSP / algorithms / systems / implementation / characterization / high-speed PA test and creative abuse of Pedal Steel Guitars

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  1. ... was just in the middle of rephrasing the above post somewhat more diplomatically. There are many good reasons to use FPGA, e.g. an FPGA engineer will probably earn a higher hourly rate than a Raspberry PI programmer so don't let me distract you 🙂
  2. Hi, >> applying various algorithms if you don't know the algorithms yet, it might be easier to get the ADC data into a softcore CPU, then prototype in C using floating point. The point is, experimental prototyping of algorithms in fixed point RTL is a slow and painful process.whereas reloading a .elf binary takes a second. I'm guessing your intent but I suspect you'll find eventually that an FPGA is not the optimal platform choice for your application. Meaning, you can most likely get the same result cheaper and with less effort e.g. using a Raspberry PI + SPI converter. I'm guessing this simply because higher-rate ADCs where FPGA makes sense (hundreds of MHz) are hard to come by as OTS modules. Otherwise, if you design for, say, 1 MSPS, the FPGA fabric will do less than 1 % of the work it could do but you pay for 100 % so people usually don't use FPGA, if a CPU or DSP will do the job.
  3. The module uses an on-board-antenna, which is always a compromise. So yes, you have the option to connect a more suitable antenna. But this is an "amateur radio" topic, there is nothing "software defined" about it. Boosting the transmitter on one side of the link for a modern two-way protocol won't help much - beyond its own transmit range, the remote end may hear you but it cannot acknowledge reception. Hint: If interested, you can do quite serious software defined "radio" with audio and loudspeakers, e.g. OFDM. The basic challenges - synchronization, frequency error estimation and correction, channel frequency response, multipath reflections etc are pretty much the same if not more visible. And, a white noise spectrum will break most loudspeakers. Don't ask how I know 🙂
  4. Hi, there's a lot of new information in your last post. You aren't just "trying" FPGA but have a professional interest in Zynq. Don't let anybody scare you it's "difficult" and go for it, possibly with the cheapest board, no tutorials and low expectations like, blinking LEDs for quite a while. Given the price tag of any industrial training coarse, an FPGA board for self-study is a no-brainer. Maybe save some money to buy your FPGA engineer a coffee once a week, with some questions in mind
  5. Hi, >> I would be really glad if someone helps  no one is going to do your course homework for you. But, I think you should talk with your supervisor. You've been thrown in at the deep end of the pool, which is OK only for someone who knows how to swim. Reading between the lines, you don't. Now if this is a follow-up to a VHDL course: Review the course material and lab exercises, it will probably give you some shortcuts. If one could teach simply by throwing people into the pool, there would be no need for schools... Otherwise, it looks (based on your post, of course), like a nasty amount of work without any focus e.g. connecting to "a" toy RC car feels like an exercise in tinkering, not engineering e.g. buy a $10 RC toy and hack the transmitter with an MTC61-ish optocoupler. To the FPGA, it looks like a LED. Do not assume it's easy (in a sense of "don't assume swimming is easy").
  6. True - the added noise breaks up "coherent" quantization error and spreads it evenly across the bandwidth (where I can usually filter away most of it digitally) Most analog designers will scratch their heads if given a minimum noise specification for the driver amp but hey, it's physics 🙂
  7. but watch out, the resolution may be closer to 8 bit than the 16 bits mentioned in the original post. This is at least what I got with a GSM signal around 900 MHz (plus a frequency offset I had to correct by resampling, since the average scope does not have a reference clock input). Your mileage may vary. I had more luck the other way using an RF vector analyzer with IQ inputs as a very expensive oscilloscope but that's about 180 degrees out of phase with the topic 🙂
  8. >> But it will cost me a bomb and I need to be sure I am investing on the correct thing. My entry for the "shortest answer" competition: Get a CMOD A7 or similar. It's dirt cheap - consider it disposable and save the idea of buying something "more capable" for long term motivation. Starting with an expensive board, then being afraid to use it for fear of breaking it does not help with learning. Zynq is significantly more complex than Artix and the FPGA part is less accessible.
  9. Before you spend money, sit down for an evening and read through forum posts. In a nutshell (see the earlier post for an example, the wideband-/narrowband configuration thing): Eval boards are not modules Sometimes it works but there is a high risk involved (such as, you place your order based on studying board revision X and get revision Y, which is completely different). If the FPGA is needed only as adapter, have a look at digitizer cards in PCI or PXI form factor.
  10. You might have a look at Trenz Electronics "Zynqberry". I think they managed to get one of the cameras to work (not sure). What I do remember is that the board has some custom resistor circuitry to additional pins for the required low-speed signaling.
  11. Just wondering, are you aware of Xilinx Webpack? It needs a license but you can just request it.
  12. Hi, since you asked for (FPGA) RAM, check out the "inferred memory" concept e.g. here: https://forums.xilinx.com/t5/Synthesis/UG901-distributed-vs-block-ram-inference/td-p/775730 if you open Vivado main window, then "Tools" menu, there is an option "Language templates". You may also find some useful material there (and some other that is very specialized). One advantage is that these examples are specific for FPGA, whereas generic VHDL instructions may be targeting ASICs or simulation, which are less restricted than FPGA.
  13. xc6lx45

    Power consumption

    what do you think? What does actually cause the power consumption in modern CMOS?
  14. Hi, >> I understand the if the pin is an output, then current should exit from it Most likely, your understanding of the output cell is wrong.The point is the "C" in CMOS, "complementary". Look at the first picture in the link - there are two (MOS) transistors, one to positive supply voltage and one to negative / GND. The pin can source and sink current. This is the magic behind almost all modern digital circuitry. And if anybody wonders what would happen if both switches would open at the same time. Magic smoke appears 🙂
  15. Maybe you want to re-think Arduino, with a professional technical background. It may be that a Raspberry Pi with the "wiring" library is more useful long term. Just as a note, the guitar FX is a surprisingly challenging project, if it's supposed to be borderline useful. E.g. "aliasing" - you bend a note up and half of the little monkeys in your sound bend down at the same time. It gets tiring