PRESENTING:
NIGUN
STARTED: JULY 2016
UPDATED: OCTOBER 2016
Software Defined Radio Israel
NIGUN
A RF downconverter
DECT
GPS
ISM 2.4GHz
BLUETOOTH
24MHz-1700MHz
PURPOSE
TO ALLOW RECEIVING OF WIRELESS SIGNALS IN FREQUENCIES HIGHER THAN 1500MHZ WITH LOWER-FREQUENCY SDR
DEV PROCESS
- Determine frequency conversions
- Design a block diagram
- Choose main components
- Design board schematics and layout
- Produce and test a prototype board
MAIN DECISIONS
- Went for a constant IF architecture (details following)
- LO will be determined by the user and programmed by the MCU
- Decided to skip most of the filtering
- It's hard to design a filter for every case
- Also, wanted to keep design flexible
- Power up and programming via micro-usb connector
- Should be able to power up from a USB power-pack
INITIAL, BASIC BLOCK DIAGRAM
Was thinking about filtering, amplification, frequency synthesis...
Luckily, I found most of them under one chip (details in a few minutes)
DETAILED,EVOLVED BLOCK DIAGRAM
TBD
changed to skyworks
found a constant LPF
MAIN COMPONENTS
MIXER + VCO\PLL
ATSAMD20E17A-MU
- 128Kb Flash
- 16Kb SRAM
- No USB controller
- Will probably use V-USB
INPUT SWITCH
OUTPUT SWITCH
POTENTIAL USE-CASES
- Down-converter
- DIY signal generator
- DIY network analyzer
- Low-power FM transmitter (by altering the VCO)
Presenting Nigun
By raziele
Presenting Nigun
1.5Ghz-3Ghz Downconverter
