At the moment Im working on a project called: Digital Television Receiver on
the 10Ghz. The 10Ghz signal is first down converted to a 1Ghz signal. Its my job
to convert this (FM modulated) signal to a 30Mhz signal. This signal needs to be
sampled (ADC) and then edited (demodulated) by a Digital Signal Processor.
The problem is to find a combination of an ADC and a DSP fast enough to handle
the signal. This need at least an ADC with a 60Mhz sample rate and a DSP with
enough MIPS to process the incoming ADC output data. One of the demands of the
ADC is that is must be at least 16bits wide.
Ive chosen for a TI DSP. To test and get familiar with the programming of the
TI DSP chips Ive got an evaluation board: C6713 DSK. (TMS320C6713).
Please let me know your suggestions for this project. Maybe you have a program
code which I can use as a base for the project.
Suggestions for an ADC and a TMS320C6713 DSP
Started by ●April 11, 2006
Reply by ●April 11, 20062006-04-11
Maarten-
> At the moment I'm working on a project called: Digital Television Receiver
> on the 10Ghz. The 10Ghz signal is first down converted to a 1Ghz signal.
> Its my job to convert this (FM modulated) signal to a 30Mhz signal. This
> signal needs to be sampled (ADC) and then edited (demodulated) by a Digital
> Signal Processor.
>
> The problem is to find a combination of an ADC and a DSP fast enough to
> handle the signal. This need at least an ADC with a 60Mhz sample rate and
> a DSP with enough MIPS to process the incoming ADC output data.
Is there a section of bandwidth less than 30 MHz you will be processing? A 300 MHz
C6713 is not going to keep up with 30 MHz in real-time and do any significant work.
> One of the demands of the ADC is that is must be at least 16bits wide.
60 MHz at 16-bits? And let me guess, you need 92 dB SNR? Did your professor spec
this project to you? If so, you might tell him he/she's asking students to invent
new technology, not use existing :-)
> I've chosen for a TI DSP. To test and get familiar with the programming
> of the TI DSP chips Ive got an evaluation board: C6713 DSK. (TMS320C6713).
This is a good choice... to be serious for a moment, I think probably what you're
trying to accomplish is do-able, but there is a misunderstanding in the specs you've
been given. If what you mainly need to do is filter the 30 MHz signal to produce one
or more baseband signals, then you might try an FPGA, followed by a DSP for
subsequent processing.
-Jeff
> At the moment I'm working on a project called: Digital Television Receiver
> on the 10Ghz. The 10Ghz signal is first down converted to a 1Ghz signal.
> Its my job to convert this (FM modulated) signal to a 30Mhz signal. This
> signal needs to be sampled (ADC) and then edited (demodulated) by a Digital
> Signal Processor.
>
> The problem is to find a combination of an ADC and a DSP fast enough to
> handle the signal. This need at least an ADC with a 60Mhz sample rate and
> a DSP with enough MIPS to process the incoming ADC output data.
Is there a section of bandwidth less than 30 MHz you will be processing? A 300 MHz
C6713 is not going to keep up with 30 MHz in real-time and do any significant work.
> One of the demands of the ADC is that is must be at least 16bits wide.
60 MHz at 16-bits? And let me guess, you need 92 dB SNR? Did your professor spec
this project to you? If so, you might tell him he/she's asking students to invent
new technology, not use existing :-)
> I've chosen for a TI DSP. To test and get familiar with the programming
> of the TI DSP chips Ive got an evaluation board: C6713 DSK. (TMS320C6713).
This is a good choice... to be serious for a moment, I think probably what you're
trying to accomplish is do-able, but there is a misunderstanding in the specs you've
been given. If what you mainly need to do is filter the 30 MHz signal to produce one
or more baseband signals, then you might try an FPGA, followed by a DSP for
subsequent processing.
-Jeff
Reply by ●April 11, 20062006-04-11
I have studied approximately same topic.
1.do not think acoording to nyquist sampling rate. You have to use bandpass sampling (subsampling). In that case ur spec.s will be changed (ADC DSP, sampling rate etc. ...).
2. I have searched FM dem. codes on the net, there is not. If u find pls share with me.
3. The best document I have found: http://www.medialab.ch/archiv/pdf_studien_diplomarbeiten/da01/fm_demodulator(haller&schnyder).pdf
4. If u want to contact efficiently pls add me ur messenger list: m...@hotmail.com
m...@hotmail.com wrote:
At the moment Im working on a project called: Digital Television Receiver on the 10Ghz. The 10Ghz signal is first down converted to a 1Ghz signal. Its my job to convert this (FM modulated) signal to a 30Mhz signal. This signal needs to be sampled (ADC) and then edited (demodulated) by a Digital Signal Processor.
The problem is to find a combination of an ADC and a DSP fast enough to handle the signal. This need at least an ADC with a 60Mhz sample rate and a DSP with enough MIPS to process the incoming ADC output data. One of the demands of the ADC is that is must be at least 16bits wide.
Ive chosen for a TI DSP. To test and get familiar with the programming of the TI DSP chips Ive got an evaluation board: C6713 DSK. (TMS320C6713).
Please let me know your suggestions for this project. Maybe you have a program code which I can use as a base for the project.
---------------------------------
New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.
1.do not think acoording to nyquist sampling rate. You have to use bandpass sampling (subsampling). In that case ur spec.s will be changed (ADC DSP, sampling rate etc. ...).
2. I have searched FM dem. codes on the net, there is not. If u find pls share with me.
3. The best document I have found: http://www.medialab.ch/archiv/pdf_studien_diplomarbeiten/da01/fm_demodulator(haller&schnyder).pdf
4. If u want to contact efficiently pls add me ur messenger list: m...@hotmail.com
m...@hotmail.com wrote:
At the moment Im working on a project called: Digital Television Receiver on the 10Ghz. The 10Ghz signal is first down converted to a 1Ghz signal. Its my job to convert this (FM modulated) signal to a 30Mhz signal. This signal needs to be sampled (ADC) and then edited (demodulated) by a Digital Signal Processor.
The problem is to find a combination of an ADC and a DSP fast enough to handle the signal. This need at least an ADC with a 60Mhz sample rate and a DSP with enough MIPS to process the incoming ADC output data. One of the demands of the ADC is that is must be at least 16bits wide.
Ive chosen for a TI DSP. To test and get familiar with the programming of the TI DSP chips Ive got an evaluation board: C6713 DSK. (TMS320C6713).
Please let me know your suggestions for this project. Maybe you have a program code which I can use as a base for the project.
---------------------------------
New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.
Reply by ●April 11, 20062006-04-11
Hi maartenbonenkamp
You're going down the wrong road thinking of using a DSP for taking
your samples. That's off by 1-2 orders on speed. It would normaly be
done with a fast FPGA. Take a look at this Altera DSP dev board to
see the kind of hardware to use for your requirement.
http://www.altera.com/products/devkits/altera/kit-dsp-2S180.html
It has converters twice the speed you need and you can download all
the schematics and other design info without buying it because they
want to sell parts. You even get a Fast Fourier Transform (FFT)
Co-Processor Reference Design for TI's TMS320C6416 DSK if you buy it.
Look at their other dev kits also.
Al
--- In c..., maartenbonenkamp@... wrote:
>
> At the moment I�m working on a project called: Digital Television
Receiver on the 10Ghz. The 10Ghz signal is first down converted to a
1Ghz signal. Its my job to convert this (FM modulated) signal to a
30Mhz signal. This signal needs to be sampled (ADC) and then edited
(demodulated) by a Digital Signal Processor.
>
> The problem is to find a combination of an ADC and a DSP fast enough
to handle the signal. This need at least an ADC with a 60Mhz sample
rate and a DSP with enough MIPS to process the incoming ADC output
data. One of the demands of the ADC is that is must be at least 16bits
wide.
>
> I�ve chosen for a TI DSP. To test and get familiar with the
programming of the TI DSP chips I�ve got an evaluation board: C6713
DSK. (TMS320C6713).
>
> Please let me know your suggestions for this project. Maybe you have
a program code which I can use as a base for the project.
>
You're going down the wrong road thinking of using a DSP for taking
your samples. That's off by 1-2 orders on speed. It would normaly be
done with a fast FPGA. Take a look at this Altera DSP dev board to
see the kind of hardware to use for your requirement.
http://www.altera.com/products/devkits/altera/kit-dsp-2S180.html
It has converters twice the speed you need and you can download all
the schematics and other design info without buying it because they
want to sell parts. You even get a Fast Fourier Transform (FFT)
Co-Processor Reference Design for TI's TMS320C6416 DSK if you buy it.
Look at their other dev kits also.
Al
--- In c..., maartenbonenkamp@... wrote:
>
> At the moment I�m working on a project called: Digital Television
Receiver on the 10Ghz. The 10Ghz signal is first down converted to a
1Ghz signal. Its my job to convert this (FM modulated) signal to a
30Mhz signal. This signal needs to be sampled (ADC) and then edited
(demodulated) by a Digital Signal Processor.
>
> The problem is to find a combination of an ADC and a DSP fast enough
to handle the signal. This need at least an ADC with a 60Mhz sample
rate and a DSP with enough MIPS to process the incoming ADC output
data. One of the demands of the ADC is that is must be at least 16bits
wide.
>
> I�ve chosen for a TI DSP. To test and get familiar with the
programming of the TI DSP chips I�ve got an evaluation board: C6713
DSK. (TMS320C6713).
>
> Please let me know your suggestions for this project. Maybe you have
a program code which I can use as a base for the project.
>
