> On Jan 25, 2021, at 8:25 AM, Bill Frantz <[email protected]> wrote: > > IEEE Binary Floating Point assumes (except in case of a very small, > de-normalized number), that the high order bit of the mantissa is a one. With > this assumption, it doesn't need to actually represent the one in memory. So, > it has 8 bits of exponent, 1 bit of sign, and 24 bits of mantissa crammed > into 32 bits. It should be able to handle the full precision of a 24 bit AtoD > converter.
If only we had 24 bits at RF. "Reasonable cost" for an ADC that can sample at 120+ MHz gets you 16 bits at present. Wayne N6KR > > 73 Bill AE6JV > > On 1/25/21 at 8:15 AM, [email protected] (Bill Coleman) wrote: > >> >>> On Jan 24, 2021, at 1:33 PM, Wayne Burdick <[email protected]> wrote: >>> >>>> (Or did we have some other definition of “higher-performance”?) >>> >>> Yes: More bits than 16, more monotonicity in the LSBs, general improvement >>> in SFDR, or lower >> internal noise. >>> >>> Adding more ADC bits does not require more DSP horsepower. The DSP is 32 >>> bit floating point. >> >> Well, that works up to 23-bits! (FP numbers have a 23-bit mantissa) > > ----------------------------------------------------------------------- > Bill Frantz | There's nothing so clear | Periwinkle > (408)348-7900 | as a design you haven't | 150 Rivermead Rd #235 > www.pwpconsult.com | written down. - Dean Tribble| Peterborough, NH 03458 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
