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[Discuss-gnuradio] Low-cost hardware options

From: Marcus D. Leech
Subject: [Discuss-gnuradio] Low-cost hardware options
Date: Fri, 14 Jan 2011 21:10:53 -0500
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I've posted my latest thoughts at:


This version has some BOM cost estimates for most of the items, and shows a new PLL, the ADF4351, which is a new chip from AD, coming out later this spring, which is pin compatible with the ADF4350, and includes a lower minimum output frequency, which means extending the range downwards to about 18MHz from about 68MHz. Cool.

Going to a AD6652 (which has built-in DDC and CIC decimators) increases the price of the 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.

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 to do DDC and CIC decimation as well as the "host interface goop" is the right trade-off.

Love to hear more opinions

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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