Explicit formula for channel mismatch effects in time-interleaved ADC systems

Kurosawa, Naoki; Maruyama, Kazuo; Kobayashi, Haruo; Sugawara, Hirotaka; Kobayashi, Kensuke

doi:10.1109/imtc.2000.848838

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…The spectra show a few sharp lines in all slices. These lines are attributed to gain and offset differences between the time-interleaved ADCs themselves and to timing skew of their clocks [31][32][33]. The same spurious lines are also present in the Fourier spectrum of the time stamps, and this corroborates their attribution to digitizer noise.…”

Section: Discussionmentioning

confidence: 53%

Bunch-by-bunch measurement of transverse coherent beam-beam modes in the Fermilab Tevatron collider

Stancari

Valishev

2012

Phys. Rev. ST Accel. Beams

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A system for bunch-by-bunch detection of transverse proton and antiproton coherent oscillations in the Tevatron is described. It is based on the signal from a single beam-position monitor located in a region of the ring with large amplitude functions. The signal is digitized over a large number of turns and Fourier analyzed off-line with a dedicated algorithm. To enhance the signal, band-limited noise is applied to the beam for about 1 s. This excitation does not adversely affect the circulating beams even at high luminosities. The device has a response time of a few seconds, a frequency resolution of 1:6 Â 10 À5 in fractional tune, and it is sensitive to oscillation amplitudes of 60 nm. It complements Schottky detectors as a diagnostic tool for tunes, tune spreads, and beam-beam effects. Measurements of coherent mode spectra are presented to show the effects of betatron tunes, beam-beam parameter, and collision pattern, and to provide an experimental basis for beam-beam numerical codes. Comparisons with a simplified model of beam-beam oscillations are also described.

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Section: Discussionmentioning

confidence: 53%

Bunch-by-bunch measurement of transverse coherent beam-beam modes in the Fermilab Tevatron collider

Stancari

Valishev

2012

Phys. Rev. ST Accel. Beams

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“…With a sinusoidal input, the mismatch errors can be seen in the output spectrum as non harmonic distortion [3]. With input signal frequency ω 0 , the gain and time errors cause distortion at the frequencies An example of an output spectrum from an interleaved ADC system with four ADCs with sinusoidal input signal is shown in Figure 2.…”

Section: • Gain Errorsmentioning

confidence: 99%

Blind equalization of time errors in a time-interleaved ADC system

Elbornsson

Gustafsson

Eklund³

2005

IEEE Trans. Signal Process.

103

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Abstract-To significantly increase the sampling rate of an A/D converter (ADC), a time interleaved ADC system is a good option. The drawback of a time interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal.In this paper we present a method for estimation and compensation of the time mismatch errors. The estimation method requires no knowledge about the input signal except that it should be band limited to the foldover frequency, π/T s, for the complete ADC system. This means that the errors can be estimated while the ADC is running. The method is also adaptive to slow changes in the time errors.The Cramer-Rao bound for the time error estimates is also calculated and compared to Monte-Carlo simulations. The estimation method has also been validated on measurements from a real time interleaved ADC system with 16 ADCs.

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“…The effect on the S/N ratio of the ADC due to offset is independent of the input frequency but is related to the sample frequency. From [9] M f k = f s noise…”

Section: Offset Mismatchmentioning

confidence: 99%

An architecture for a reconfigurable charge summation based ADC

Duignan

Farrell

2005

5th IEE International Conference on ADDA 2005. Advanced a/D and D/a Conversion Techniques and Their Applications

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Presented in this paper is a low power, area efficient reconfigurable analog-to-digital (ADC) converter, utilising a charge-summation technique with a switched-capacitor implementation. Using a non-inverting switched-capacitor integrator a staircase ramp is produced using switching capacitors and a fixed reference voltage, as opposed to a linear ramp. The advantage of the charge summation technique is the reduction in power usage as the charging time of the capacitors is small so for most of the sample period the circuit is quiescent. The paper presents the use of this architecture as a reconfigurable ADC for use in a reconfigurable radio.

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Explicit formula for channel mismatch effects in time-interleaved ADC systems

Cited by 13 publications

References 7 publications

Bunch-by-bunch measurement of transverse coherent beam-beam modes in the Fermilab Tevatron collider

Bunch-by-bunch measurement of transverse coherent beam-beam modes in the Fermilab Tevatron collider

Blind equalization of time errors in a time-interleaved ADC system

An architecture for a reconfigurable charge summation based ADC

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