What is the dynamic range of a 3-bit A/D converter? I predict no one will get this. Which makes it a good job interview question. -- Rich
daily quiz
Started by ●March 6, 2016
Reply by ●March 7, 20162016-03-07
On 3/6/2016 10:55 PM, RichD wrote:> What is the dynamic range of a 3-bit A/D converter? > I predict no one will get this. > Which makes it a good job interview question.Ok, I'll byte. 7:1 or 16.9 dB, but doesn't it really depend on the noise floor? Often the noise floor is not as low as the lsb. -- Rick
Reply by ●March 7, 20162016-03-07
On Sunday, March 6, 2016 at 10:55:57 PM UTC-5, RichD wrote:> What is the dynamic range of a 3-bit A/D converter? > I predict no one will get this. > Which makes it a good job interview question. > > -- > RichCannot be determined as asked. Using the definition "Dynamic range is the difference between the smallest and largest usable signal through a transmission or processing chain or storage medium." (Electropedia (IEC)) you run into the question of "What is usable?" in the context of the question, which has not been specified. But, I will bet there are a lot of people who do THINK it is a good interview question, and have a specific number in mind for the answer, which makes it a POOR interview question when asked by them. What do YOU think the answer is RichD? Dirk
Reply by ●March 7, 20162016-03-07
On Sun, 06 Mar 2016 21:06:06 -0800, bellda2005 wrote:> On Sunday, March 6, 2016 at 10:55:57 PM UTC-5, RichD wrote: >> What is the dynamic range of a 3-bit A/D converter? >> I predict no one will get this. >> Which makes it a good job interview question. >> >> -- >> Rich > > Cannot be determined as asked. > > Using the definition "Dynamic range is the difference between the > smallest and largest usable signal through a transmission or processing > chain or storage medium." (Electropedia (IEC)) you run into the question > of "What is usable?" in the context of the question, which has not been > specified. > > But, I will bet there are a lot of people who do THINK it is a good > interview question, and have a specific number in mind for the answer, > which makes it a POOR interview question when asked by them. > > What do YOU think the answer is RichD? > > DirkI always ask "what and why" when I ask such questions. Sometimes in the "why" part I learn something new, and then those interviewees get bumped into the "must hire" list. -- www.wescottdesign.com
Reply by ●March 7, 20162016-03-07
RichD <r_delaney2001@yahoo.com> writes:> What is the dynamic range of a 3-bit A/D converter? > I predict no one will get this. > Which makes it a good job interview question.From section 1 here, http://www.digitalsignallabs.com/presentation.pdf (which I believe was in part taken from Rick's book), and assuming a sine wave, I get 19.83 dB. What do you get? -- Randy Yates, DSP/Embedded Firmware Developer Digital Signal Labs http://www.digitalsignallabs.com
Reply by ●March 7, 20162016-03-07
On Sun, 06 Mar 2016 19:55:50 -0800, RichD wrote:> What is the dynamic range of a 3-bit A/D converter? > I predict no one will get this. > Which makes it a good job interview question.If it's an ideal (0 noise, infinitely fast, 0 INL and 0 DNL) 3-bit A/D converter you can wrap a Delta Sigma modulator around it and then the dynamic range is only limited by the analog components and your PCB layout skills. Allan
Reply by ●March 7, 20162016-03-07
On 3/6/2016 9:55 PM, RichD wrote:> What is the dynamic range of a 3-bit A/D converter? > I predict no one will get this. > Which makes it a good job interview question. > > -- > Rich >You folks are too nonconformist. The dynamic could be 8 nepers ;/
Reply by ●March 7, 20162016-03-07
On 07.03.2016 16:27, Richard Owlett wrote:> On 3/6/2016 9:55 PM, RichD wrote: >> What is the dynamic range of a 3-bit A/D converter? >> I predict no one will get this. >> Which makes it a good job interview question. >> >> -- >> Rich >> > > You folks are too nonconformist. > The dynamic could be 8 nepers ;/How did you get that value? Following the definition of a neper as found in Wikipedia, http://en.wikipedia.org/wiki/Neper it's more like approximately 2 nepers (rounded to a nearest integer). Regards, Evgeny.
Reply by ●March 7, 20162016-03-07
On 3/7/2016 6:47 AM, Randy Yates wrote:> RichD <r_delaney2001@yahoo.com> writes: > >> What is the dynamic range of a 3-bit A/D converter? >> I predict no one will get this. >> Which makes it a good job interview question. > > From section 1 here, > > http://www.digitalsignallabs.com/presentation.pdf > > (which I believe was in part taken from Rick's book), and assuming a > sine wave, I get 19.83 dB. What do you get?I don't see any mention of dynamic range in this presentation... !? What formula did you use? -- Rick
Reply by ●March 7, 20162016-03-07
rickman <gnuarm@gmail.com> writes:> On 3/7/2016 6:47 AM, Randy Yates wrote: >> RichD <r_delaney2001@yahoo.com> writes: >> >>> What is the dynamic range of a 3-bit A/D converter? >>> I predict no one will get this. >>> Which makes it a good job interview question. >> >> From section 1 here, >> >> http://www.digitalsignallabs.com/presentation.pdf >> >> (which I believe was in part taken from Rick's book), and assuming a >> sine wave, I get 19.83 dB. What do you get? > > I don't see any mention of dynamic range in this presentation... !? > > What formula did you use?The one for SNR. SNR == DR. Perhaps I've put my foot into a thread of no practical value. I am not interested in debating definitions unless it can clearly be demonstrated to have some practical value. -- Randy Yates, DSP/Embedded Firmware Developer Digital Signal Labs http://www.digitalsignallabs.com
