Category Archives: Data Converter

Brief Study of Noise-Shaping SAR ADC – Part C

The topic of noise-shaping SAR ADC will come to an end in this post. In Part A, I briefly talked about the concept of noise shaping applied to sigma-delta modulators. In Part B, I introduced one special property of SAR … Continue reading

Posted in Data Converter | Tagged | 2 Comments

Brief Study of Noise-Shaping SAR ADC – Part B

In the previous post, I’ve shared some basics of sigma-delta ADC. In this post, before we look at the noise-shaping SAR ADC, let’s again do a warm-up. The z-domain linear model for a 1st-order sigma-delta modulator: The linear model has … Continue reading

Posted in Data Converter | Tagged | 1 Comment

Brief Study of Noise-Shaping SAR ADC – Part A

Sometimes it is much easier to become a fan of something when you only know something about it. Just like Sigma-Delta ADC, it is so complicated that even though I have learned it for several times I still can’t fully understand it! Nevertheless, I am … Continue reading

Posted in Data Converter | Tagged , , | 3 Comments

Noise Effect On The Distribution of ADC Output Codes

In the previous post, the probability of comparator decision with the existence of noise was calculated. In this post, the topic about noise and probability will continue. The whole topic is actually inspired by a 1986-paper [1], which discusses noise effect … Continue reading

Posted in Data Converter | Tagged , , | Leave a comment

Brief Study of Dither C: Dithered DNL

In ‘Dither’ series B, I have shown dither reduces the harmonic distortion by decolalizing the code mapping of the analog signal from the transfer curve. So if we take a step further, we might say the main purpose of dither is … Continue reading

Posted in Data Converter | Tagged , , , | 4 Comments

Brief Study of Dither B: Dither

In ‘Dither’ series A, I mentioned that the quantization will introduce large harmonics to a low-level sinusoidal signal. Let’s look at another example in Figure 1 [1]. Adding dither to the circuit means adding noise to the circuit. Now let’s … Continue reading

Posted in Data Converter | Tagged , , | 1 Comment

Brief Study of Dither A: Before Dither

Does it make sense to add noise to enhance the converter’s performance? Dither – a puzzle to me for quite a long time. Recently I had time to read several related papers and APs. I would like to share some … Continue reading

Posted in Data Converter | Tagged , , | 1 Comment