On 15.01.2011 03:10, Marcus D. Leech wrote: > I've posted my latest thoughts at: > > http://www.sbrac.org/files/digital_receiver2.pdf > > This version has some BOM cost estimates for most of the items, and > shows a new
I counted $75, let's say $100 (incl. voltage conrollers, R/C), plus $50 for PCB (if we order more units). Is $150 a realistic value for material and PCB? Plus $150 to $250 for a cheap FPGA board, or even a cheaper USB board. Not too much for a hobby instrument. But I would suggest an option to switch to a second input, directly into the ADC, to cover the range DC to 10 MHz, or to attach an external RF, IF (e.g. from an amateur radio). Or a second board without mixer, just replacing it on the FMC connector, similar to the USRP daughterboard system. > ADC by a factor of 3, but it would eliminate the need for a FPGA on > the "host interface" > side of that FMC connector. So, you're trading a more expensive > digital-receiver section > for a cheaper "host interface" section. For example, by using an > AD6652, one could > easily conceive of nothing more than a cheap EZ-FX2 USB-2.0 > implementation on > the host-interface side. I looked at the CY7C68013 EZ-USB FX2 data sheet. Is it true that we wouldn't need any FPGA glue logic to control the receiver, for the frequency synthesizer, flow control etc. ? There are lots of IO pins and busses on the FX2. The embedded 8051 µC could be used to control the receiver. > For at least USB-3.0 and 1GiGe, you pretty-much *need* an FPGA on the > host-interface board > to do all the relevant protocol goop anyway, so perhaps making that > FPGA large enough I think for USB you don't have to deal with the protocol. USB chips will handle this, similar to the EZ-USB. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
