Second order ΔΣ modulators using AlGaAs/GaAs HBTS

Nary, K.R.; Beccue, S.; Nubling, R.B.; Pierson, R.; Wang, Keh-Chung; Zampardi, P.J.; Jayaraman, A.

doi:10.1109/gaas.1994.636974

Cited by 4 publications

(2 citation statements)

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“…A different type of DAC feedback pulse, either return‐to‐zero (RZ) or half‐return‐to‐zero (HRZ), is suggested by Schoofs et al ., [7] to compensate the excess loop delay. This method has been studied for decades [8, 9]. Besides the function of immunity to excess loop delay, a RZ DAC pulse also suppresses inter‐symbol interference problems caused by non‐symmetrical DAC pulse edge time [10].…”

Section: Introductionmentioning

confidence: 99%

Compensation method of the excess loop delay in continuous‐time delta‐sigma analog‐to‐digital converters based on model matching approach

Guo

Magaña

2016

IET Circuits, Devices & Systems

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Continuous-time (CT) delta-sigma (Δ∑) analog-to-digital converters (ADCs) have one important constrain, namely the excess loop delay. Most excess loop delay compensation methods need to know the exact value of the excess loop delay in advance. However, the value of the excess loop delay is a uniformly distributed random variable. To improve system performance with the same loop filter, a new compensation algorithm for the excess loop delay of CT Δ∑ ADCs based on the model matching method is presented in this study. Compared with previous compensation methods, the model matching algorithm is more practical because the value of the excess loop delay varies randomly every clock period. It is shown through simulation that a mean value based algorithm can improve the SQNR performance of CT Δ∑ ADCs for the most probable values of the excess loop delay.

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Section: Introductionmentioning

confidence: 99%

Compensation method of the excess loop delay in continuous‐time delta‐sigma analog‐to‐digital converters based on model matching approach

Guo

Magaña

2016

IET Circuits, Devices & Systems

View full text Add to dashboard Cite

show abstract

“…Continuous-time modulators are much faster [3j and provide anti-alias filtering [4]. Several continuous-time AZ modulators with sampling rate in the GHz range have been reported recently to extend the application to RF frequencies [3j [6] [73. It is known, however, that continuous-time AX modulators suffer from performance degradation due to nonidealities such as excess loop delay and clock jitter in the delta-sigma modulator loop.…”

Section: Introductionmentioning

confidence: 99%