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Digital RF ?
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mitgrace



Joined: 08 May 2004
Posts: 366
Helped: 4
Post18 Jul 2006 11:02   

Digital RF ?
Dear all :
I read the TI/ DVB-H chip, Holloward. It said it use digital RF, What is the mean ? Does anyone know it ? Or any reference document? Thanks
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ajhsu



Joined: 04 Apr 2004
Posts: 224
Helped: 3
Post18 Jul 2006 11:26   

Re: Digital RF ?
Using digital technique to implement RF circuits.
For instance, use directly sample circuits instead of conventional mixer.
DSP technique can do a lot of post-processing.
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dinone



Joined: 14 Feb 2003
Posts: 45
Helped: 8
Post18 Jul 2006 13:27   

Re: Digital RF ?
The TI/DVB-H Hollywod device use a ZIF architecture to convert the RF data to DC. After there is a ADC to enter in the digital part. Seems that the device doesn't work well (CMOS technology, high fliker noise), so seems that TI will develope a DVB-H receiver with the RF part in low IF. In any case digital RF means that after the antenna there is a LNA and after a ADC to convert the signal in digital. In this moment it is not possible to have an ADC sampling frequency so high to convert directly the RF to Digital. If you want understand you can see the digital device for the FM radio (about 100 MHz RF frequency)

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Post18 Jul 2006 13:27   

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mitgrace



Joined: 08 May 2004
Posts: 366
Helped: 4
Post18 Jul 2006 14:29   

Re: Digital RF ?
Dear dinone:

Thanks your comment. The FM (100MHz) Frequency, What do u ? which product or which device have this digital RF? Can u give me the part number? Thanks
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vfone



Joined: 10 Oct 2001
Posts: 2327
Helped: 326
Post18 Jul 2006 20:46   

Re: Digital RF ?
http://www.digrf.com/
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dinone



Joined: 14 Feb 2003
Posts: 45
Helped: 8
Post19 Jul 2006 7:43   

Re: Digital RF ?
You can try in the SiliconLab internet site. They are clever with the digital receive. You can try also with ITOM devices.

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