PRESENTING:
NIGUN
STARTED: JULY 2016
UPDATED: OCTOBER 2016
![](https://www.everplans.com/sites/default/files/blog-images/meetup-logo-750.jpg)
Software Defined Radio Israel
NIGUN
A RF downconverter
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/2848344/music-notes-border-clipart-notes-hi.png)
DECT
GPS
ISM 2.4GHz
BLUETOOTH
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/2848365/HTB12ylFGXXXXXbpXpXXq6xXFXXXT.jpg)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/2849067/Screen_Shot_2016-07-17_at_00.49.17.png)
INITIAL, BASIC BLOCK DIAGRAM
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/2848359/FullSizeRender_4.jpg)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/3077425/File_4.10.2016__17_58_45.jpeg)
TBD
changed to skyworks
found a constant LPF
MAIN COMPONENTS
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/3077375/Screen_Shot_2016-10-04_at_17.59.03.png)
MIXER + VCO\PLL
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/3077636/Screen_Shot_2016-10-04_at_19.01.11.png)
ATSAMD20E17A-MU
- 128Kb Flash
- 16Kb SRAM
- No USB controller
- Will probably use V-USB
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/3077377/Screen_Shot_2016-10-04_at_18.00.13.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/150163/images/3077379/Screen_Shot_2016-10-04_at_18.00.38.png)
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
- 1,799