Fundamental requirements for a radio board:
- FPGA
- Power supplies (switchers or linear regulators for multiple voltages)
My preference would be linear regulators, just from a simplicity
standpoint. I'm a fan of Linear Tech--they're not the least
expensive, but they are the best--and have been looking at the
LT1763. It provides 500 mA output, low noise, low dropout voltage,
and various input/output protection circuits. $2.29 each in
quantities of 100, and we'll probably need at least 3 on the board
(3.3V Digital, 3.3V Analog, and 1.8V Digital).
- ADC/DAC (any decisions on these yet?)
It looks like we're going to go with the AD9860/9862, and design the
board so that either one can be installed.
- Frequency source(s)
- Control interfaces for radio (SPI/I2C)
- FPGA Configuration stuff (Flash memory or Beagle interface)
We'll need to sort this out for sure. I'm thinking JTAG (as a
backup) plus Active Serial (EEPROM and/or from the Beagle) would be a
good option. If there's a better choice, though, we need to decide on it soon.
Chris
- JTAG Download/debug interface.
Should be fairly compact...
Eric
-------------------------------------
Chris R. Anderson, Ph.D.
[EMAIL PROTECTED]
410-293-6185
Assistant Professor
US Naval Academy
Electrical Engineering Department
105 Maryland Avenue
Annapolis MD 21402
