Increasing the ADC precision with oversampling in a flash ADC

Abumurad, Abdulrahman; Choi, Kyusun

doi:10.1109/icsict.2012.6467786

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…• Discussion 1: When 0 < σ/q < 1/6, it depicts that the system is in extreme low thermal noise and the input signal between channels are strongly correlated. Such case has been discussed previously in (8), and var[n] ≈ 0 in (11). Then the quantization noise has an averaged power of DF(σ ) ≈ q 2 /12, i.e.…”

Section: Fullscale V Inmentioning

confidence: 76%

“…First, the noise level of prototype itself should be tested that is denoted as σ/q in (8). Here, a classical thermal noise measurement method of the histograms measurement in reference.…”

Section: B Test Platform and Noise Measurementmentioning

confidence: 99%

“…By averaging two successive points in a measurement, the effective-number-of-bit (ENOB) can be improved by 0.5-bit. ( [8]. Extra resolution improvement can be gained with more averaging points.…”

Section: Introductionmentioning

confidence: 99%

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General Analysis of Resolution Enhancement on Time-Synchronized Sampling and its Multi-Resolution Solution in 20GSPS Acquisition System

Huang

Gao

et al. 2019

IEEE Access

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Multiple resolutions have become a new feature required in ultra-fast data acquisition systems (UF-DASs) for various high-end applications, especially for large-scale physical experiments and radar equipment. However, plenty of repetitive efforts are paid to build various UF-DASs with different resolutions for many similar purposes. In this paper, a system-level sampling solution featuring multi-resolution is explored for UF-DASs to make the trade-off between accuracy and speed. Firstly, a resolution enhancement mechanism based on a time-synchronized sampling technique is studied more generally with probabilistic and statistical theory, and its applicable premise is discussed quantificationally at the same time. Then, a hardware-based reconfigurable structure for the purpose of multi-resolution high-speed sampling is discussed with the combination of time-interleaved and time-synchronized sampling methods. Furthermore, to verify the proposed theory, a prototype with a maximal 20GSPS sampling rate and different resolutions of 8,9,10-bit is established. The experimental results show that three vertical resolutions of 8, 9 and 10-bit are achieved in the same prototype, and the effective-number-of-bit (ENOB) in the two higher resolution modes has been improved remarkably from a single low-resolution analog-to-digital converter (ADC). Therefore, the proposed theory and multi-resolution sampling solution are important guides to the resolution trade-off requirement in ultra-fast acquisition systems.INDEX TERMS Ultra-fast data acquisition system, time-synchronized analog-to-digital conversion (TSADC), resolution enhancement and multi-resolution sampling.

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Section: Fullscale V Inmentioning

confidence: 76%

“…First, the noise level of prototype itself should be tested that is denoted as σ/q in (8). Here, a classical thermal noise measurement method of the histograms measurement in reference.…”

Section: B Test Platform and Noise Measurementmentioning

confidence: 99%

See 1 more Smart Citation

General Analysis of Resolution Enhancement on Time-Synchronized Sampling and its Multi-Resolution Solution in 20GSPS Acquisition System

Huang

Gao

et al. 2019

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Each increment of the four times oversampling factor will improve the 1‐bit effective number of bits (ENOB) [2]. The relationship between the SNR and the ENOB [3] is expressed as

SNR false(dB false) = 6.02 \times ENOB + 1.76

Owing to the nearly linear relationship between voltage and time during the rise/fall edge, increasing the ENOB is important for achieving the picosecond resolution. By using 256 times oversampling, the ENOB increases by four bits in this Letter.…”

Section: Rise/fall Time Measurementmentioning

confidence: 99%

“…Each increment of the four times oversampling factor will improve the 1-bit effective number of bits (ENOB) [2]. The relationship between the SNR and the ENOB [3] is expressed as SNR(dB) = 6.02 × ENOB + 1.76…”

mentioning

confidence: 99%