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Re: [Discuss-gnuradio] SNR of ADC

From: Fernando Peral
Subject: Re: [Discuss-gnuradio] SNR of ADC
Date: Tue, 28 Feb 2017 16:05:12 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

I think that since  in the scenario you are describing there is all virtual there is no ADC but the round aproximation from the cos(t) function to a fixed number of bits used to represent the number with a float the computer is using, so the noise you can see in the FFT is the is indeed a quantization error altough not related to any ADC. 
If you hace more blocks like an adder, a multiply, etc. The noise will be the result of all the mathematical operations involved in the process using finite bits.


El 28/02/17 a las 14:53, Sagnik Basu escribió:

I just have a thought - when we use a signal source block to generate a sine wave and use the FFT block to visualize the power spectrum, then the noise floor we see at the FFT window - is it the quantization error of the ADC within the PC running GNURadio?

Sagnik Basu
B. Tech | 2013-2017
Dept. of Electronics and Communication
NIT Rourkela
M: 8337942928

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