Accurate RF voltage measurements using a sampling voltage tracker

Souders, T. M.; Hetrick, P.S.

doi:10.1109/19.192325

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…Earlier work at NIST and elsewhere [2,3,4] has shown equivalent-time sampling comparator systems (SCSs) to be capableof providingwideband, high accuracy nns measurements, although at substantialcost in tenns of setup and measurement time. A significant degree of expertise on the part of the operator is also required.…”

Section: A Prior Artmentioning

confidence: 99%

“…To assure the ... lowest truncation errors, the exact scale-factor of the time-base range is automaticallymeasured periodically via the time-base autocalibrationcircuit described in section III. As shown in [6], thetnmcationenur (asswningit is «I), relative to the true mean 2 squared value Vp /2, £an be represented as 1 sin_ 0-oos(2u -~-y) M sin y (3) where the truncation angle 0 is the difference between the SUIIUDation interval, givenby My, andthe nearest integral number of periods, P, of the sine wave, i.e., 6 !!! 21C P -My.…”

Section: A Truncation Eltorsmentioning

confidence: 99%

“…The errors exhibit non-harmonically related patterns vs. sampling index, m. In pathological cases. the resulting error in the estimate of the rms value of a sine wave can approach the maximum possible error caused by time-base nonlinearity [3], namely 4.P.,; , where,;. the peak proportional time-base error, is in this case 2-(b+1), with b the resolution of the time-base DAC, in bits.…”

Section: Time-base Quantization and Linearity Errorsmentioning

confidence: 99%

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A wideband sampling voltmeter

Souders

Waltrip

Laug

et al. 1997

IEEE Trans. Instrum. Meas.

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A high accuracy sampUng voltmeter, designed to span thefrequency range of 10Hz to 200 MHz, is described. The instrument operates autonomously, at a measurement updaterate of at leastoneper second. A novel quasi-equivalent time sampUng process is used, with a custom strobed comparatoras the sampUng device and decision element The architecture and control are presented, along with the timebasedesignprinciples.Major error sources associated with the time-base are also discussed.

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Section: A Prior Artmentioning

confidence: 99%

Section: A Truncation Eltorsmentioning

confidence: 99%

Section: Time-base Quantization and Linearity Errorsmentioning

confidence: 99%

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A wideband sampling voltmeter

Souders

Waltrip

Laug

et al. 1997

IEEE Trans. Instrum. Meas.

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“…This system is capable of making state-of-the-art equivalent-time measurements for signals with frequency components up to 200 MHz [ 15 ]. The rf rms voltage measurement accuracy of this system has been shown to be comparable to that of thermal voltage converter standards [ 42 ].…”

Section: Measuring Waveform Parameters Using Digital Samplingmentioning

confidence: 99%

Standards for waveform metrology based on digital techniques

Bell

1990

J. RES. NATL. INST. STAN.

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Over the last decade the use of digital synthesis and sampling techniques for generating and measuring electrical waveforms has increased dramatically with the availability of improved digital-to-analog (D/A) and analog-to-digital (A/D) converters and related devices. With this evolution has come the need for physical laboratory standards and test methods to support the performance specifications of digital devices and the instruments in which they are used. This article describes the research and development at NIST of several laboratory standards and test systems that utilize “digital technology” for characterizing data converters and for implementing various waveform synthesis and sampling instruments.

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“…As stated in [6], this quantization causes noise in the sampled signal data that is similar to jitter, but cannot be reduced by averaging, since the noise is deterministic and correlated to the input signal. This noise will cause errors in waveform parameter estimates that are difficult to predict, although error bounds for the estimate of the rms value of a sinewave have been determined [8,9]. The approach taken in the design of this time-base has been to give the time-base adequate resolution (0.2 ps) to minimize the effects of quantization, relative to other sources of error.…”

Section: Sources Of Error a Quantization Errorsmentioning

confidence: 99%

Improved time-base for waveform parameter estimation

Waltrip

Laug²,

Stenbakken³

Proceedings of the 17th IEEE Instrumentation and Measurement Technology Conference [Cat. No. 00CH37066]

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An improved gated-oscillator time-base and associated auto-calibration algorithm f o r use in a high-accuracy sampling waveform acquisition system are described. The time-base architecture consists of a stable 1 OOMHz gatedoscillator, 24-bit counter chain, and a clock period interpolator. The nominal, uncorrected linearity of the time-base is approximately V3O ps. By using an iterative, sine@ based algorithm, the linearity has been improved to V5 ps. Details of the performance and major sources of error of the time-base and correction algorithm in an equivalent time sampling system are also discussed.

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Accurate RF voltage measurements using a sampling voltage tracker

Cited by 12 publications

References 7 publications

A wideband sampling voltmeter

A wideband sampling voltmeter

Standards for waveform metrology based on digital techniques

Improved time-base for waveform parameter estimation

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