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RSP1A-14bit-ADC-info
Posted: Wed Dec 13, 2017 6:57 pm
by mrzfrn
The claim RSP1A has 14bit ADC puzzles me a lot.
Mirics MSi2500 chip on RSP1 was known as 12bit ADC, ENOB 10.5 bit .
A new improved chip ? Or what ?
Francesco
Re: RSP1A-14bit-ADC-info
Posted: Wed Dec 13, 2017 7:38 pm
by g1hbe
Apparently the Mirics chip has always had 14-bit capability, but its original application did not need it and it was 'turned off'. Now the SDRPlay team has found a way to unlock the extra performance, but only at sample rates below 6 MHz.
Re: RSP1A-14bit-ADC-info
Posted: Wed Dec 13, 2017 8:00 pm
by Tech_Support
The original application required 8 MHz sampling for TV signals and it is simply not possible to put 14 bits I and Q sampling through a USB 2.0 interface at 8 MHz and so 14 bit operation was not considered to be of any value at the time. That is why 14 bit mode is limited to 6 MHz sampling. The 10.4 ENOB was specified for 8 MHz sampling and includes non-linearities, and spurs as well as quantisation noise.
Sincerely
SDRplay Tech_Support
Re: RSP1A-14bit-ADC-info
Posted: Thu Dec 14, 2017 9:40 am
by CaptainNemo
Question for tech support about RSP1.
Was this feature unlocked also for RSP1 in the latest version of drivers and sw?
Or maybe this will be done in future releases of sw?
(Maybe you have already posted on this argument... maybe i didn't got your post...)
Bye
Gio
Re: RSP1A-14bit-ADC-info
Posted: Thu Dec 14, 2017 10:21 am
by Sasan
CaptainNemo wrote:Question for tech support about RSP1.
Was this feature unlocked also for RSP1 in the latest version of drivers and sw?
Or maybe this will be done in future releases of sw?
(Maybe you have already posted on this argument... maybe i didn't got your post...)
Bye
Gio
Hey Gio
I think what you're asking is answered here:
viewtopic.php?f=7&t=2689