I'd recommend this
ADI-simRF
https://form.analog.com/form_pages/rfcomms/adisimrf.aspx
easy to use. very friendly GUI lets you do what you might guess you
might want to do.
and ideally you'll need to precisely calculate your ADC noise figure for
the last term (block) in ADIsimRF.
dealt with very well here :
http://www.analog.com/media/en/training-seminars/tutorials/MT-006.pdf
and here
http://www.tij.co.jp/jp/lit/an/slyt090/slyt090.pdf
On 27/02/2015 2:06 AM, Chris Testa wrote:
David,
There's a free tool from Analog Devices called the ADIsimRF that will
let you do a similar RF System Analysis. It's not as feature rich,
and needs a windows machine to run, but it'll let you compute these
important performance metrics.
At the end of the day the math doesn't turn out to be too hard for
these things, and is covered in many RF design textbooks. I've found
Microwave Engineering by Pozar to be an excellent companion for
building a radio, one that doesn't shy away from the math.
Chris
On Thu, Feb 26, 2015 at 12:46 AM, Helmut <[email protected]
<mailto:[email protected]>> wrote:
Hi David,
for the estimation I used a commercial tool called SysCalc,
developed by
Arden Technologies, Inc. The input data have been assumed:
Frontend BPF:
typ. 2 dB NF, 2 dB insertion loss, OIP3 50 dBm; NE6o2: 5 dB NF, 17
dB gain,
-12 dBm OIP3; channel filter: 3 dB NF, 3 dB insertion loss, OIP3
100 dBm;
ADC: 50 dB NF (!)
My only intention was to prevent disappointment, hi.
73, Helmut, DC6NY
-----Ursprüngliche Nachricht-----
Von: David Rowe [mailto:[email protected] <mailto:[email protected]>]
Gesendet: Mittwoch, 25. Februar 2015 23:08
An: [email protected]
<mailto:[email protected]>
Betreff: Re: [Freetel-codec2] Simple SDR for VHF FreeDV
Hi Helmut,
Can you please tell me how you worked that out? My next step is
to add gain
to balance MDS and IP3 but not sure how you obtained those numbers!
Yes the radio as it stands requires another design pass. At this
stage it
is a "proof of concept" to test the novel features: such as the
use of a uC
for most of the tuning, and extreme hardware simplicity.
Thanks,
David
On 26/02/15 08:09, Helmut wrote:
> Hello David,
>
> a rough simulation of that SDR design predicts a rather deaf radio:
> Total noise figure = 38 dB, MDS=-95dBm @ 12,5kHz System BW,
Input IP3 =
-20 dBm.
> I would suggest at least a 20 dB preamp with high IP3 performance in
> front of the ADC. So you will achieve a MDS of -114 dBm. Sure no
> splendid value, but will detect some VHF signals, hi.
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: David Rowe [mailto:[email protected]
<mailto:[email protected]>]
> Gesendet: Dienstag, 24. Februar 2015 22:16
> An: [email protected]
<mailto:[email protected]>;
> [email protected] <mailto:[email protected]>
> Betreff: [Freetel-codec2] Simple SDR for VHF FreeDV
>
> Hello,
>
> To support VHF FreeDV developments I've been working on a really
> simple and very open SDR architecture for VHF radio:
>
> http://www.rowetel.com/blog/?p=3884
>
> Glen and Matt - would appreciate you suggestions on appropriate
input
> BPF filtering and a VHF mixer. Also pls let me know if you see any
> show stoppers in this architecture.
>
> Cheers,
>
> David
>
>
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RF Communications and Electronics Engineer
CORTEX RF
&
Pacific Media Technologies Pty Ltd
ABN 40 075 532 008
PO Box 5231 Lyneham ACT 2602, Australia.
au mobile : +61 (0)418 975077
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