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This paper presents an analysis on capacitor mismatch and parasitic capacitors effect of the improved segmented-capacitor array to alleviate the limitation of mismatching …
This paper presents an analysis on capacitor mismatch and parasitic capacitors effect of the improved segmented-capacitor array to alleviate the limitation of mismatching …
Hi,there I am working with a 8b pipeline ADC. People said limitation of capacitor is mismatch more than thermal noise. So I want to calculate the mismatch between Cs and Cf in the MDAC with the help of foundry process files. When I checking the documents, I find the paremeters table below with...
In this brief, two figures of merit and a switched-capacitor filter are used to estimate and measure, respectively, the mismatch between fully integrated capacitors. The theoretical estimations are compared with the experimental results obtained for different layouts fabricated in a test chip using a 0.35-μm CMOS technology.
including 1% 3σ nominal capacitor mismatch, 10-20% random-ized parasitic capacitors, 66 dB opamp gain, and 30 mV opamp offset. 1. INTRODUCTION Switched-capacitor data converters commonly suffer from the finite matching accuracy of capacitors. A variety of techniques have been proposed to minimize this problem, such as mismatch-
This paper presents an efficient modeling method for the effects of capacitor mismatches in SAR ADCs. As the capacitor mismatch can severely degrade accuracy, i.
However, capacitor mismatches degrade ADC performance in terms of DNL and INL. In this work, a split CDAC mismatch calibration method is proposed. A bridge capacitor larger than conventional design is implemented so that a tunable capacitor can be added in parallel with the lower-weight capacitor array to compensate for mismatches.
This paper presents a design methodology for a low-power, low-chip-area, and high-resolution successive approximations register (SAR) analog-to-digital converter (ADC). The proposed method includes a segmented capacitive DAC (C-DAC) to reduce the power consumption and the total area. An embedded self-calibration algorithm based on a set of …
mismatch among capacitors is still left to be the performance-limiting factor. Adopting dynamic element matching (DEM) can reduce the effect of capacitor mismatch. However, applying DEM brings about complicated circuit blocks and is limited to only a part of capacitor bank of SAR ADC [13, 14]. The calibration technique has been considered to
This research is centered on the comparison of Shunt Capacitor Bank (SCB) and Static Var Compensator (SVC) performance in terms of power system loss reduction. ... reactors to consumed the VAR ...
This paper presents a modelling technique for major limitations, i.e. capacitor mismatch and non-linearity effects. The model is besed on Monte Carlo simulations applied to an analytical …
A novel capacitor mismatch calibration method is presented to compensate the capacitor mismatches in a successive approximation register (SAR) ADC. The method features a new weight-balancing split capacitive DAC …
This Letter proposes a histogram-based calibration technique to correct SAR ADC capacitor mismatch. The calibration utilises a histogram windowing technique to detect capacitor mismatch. A recursive algorithm is proposed to iteratively tune all the bit weights. The algorithm is entirely digital and does not require any additional analogue circuits.
10% capacitor mismatch show that the SNDR and SFDR are improved by 13.9dB and 34.9dB respectively with the proposed calibration technique. The calibration technique is effective under
An error cancellation technique is described for suppressing capacitor mismatch in a successive approximation A/D converter. At the cost of a 50% increase in the conversion time, the first …
The conversion accuracy of successive approximation register (SAR) analog-to-digital converter (ADC) is mainly affected by the capacitor mismatch. In this brief, a …
The Reactor & capacitor are connected between phase & neutral with two thyristor in anti parallel manner for both reactor & capacitor. Then the load is connected to the circuit. The main requirement of CT & PT is to measure power factor, voltage & …
14-bit capacitor-resistor combined ADC. In the simulation, only the capacitor mismatch is considered. The capacitor mismatch for every capacitor is randomly generated and the values of the unit capacitors are taken to be Gaussian random variables with standard deviations of 0.1%, 0.2%, 0.3% and 0.4% respectively to cover as much different ...
This paper presents an efficient modeling method for the effects of capacitor mismatches in SAR ADCs. As the capacitor mismatch can severely degrade accuracy, it is necessary to …
Fig. 2. Equivalent circuits of the L-side capacitor array. 1 2 1 16 16 C P B P B P EF C C C C C C C C C + + + + + ⋅ = ( ) Adjust CC until CEF is equal to the unit capacitor C. It can be easily calculated that the L-side capacitor array has the correct weight in the charge redistribution when CC=15(CB+CP2)-16C-CP1. For a more general case, the ...
Hence, use of detuned reactor in series with capacitor will offer higher impedance for harmonics, thus eliminating risk of over load in capacitors. The inductance value of detuned reactor is selected such that the resonance …
the previous capacitor arrays including the conventional capacitor array [5] and the splitting capacitor array [7, 8], all the capacitors are involved in deriving Vout so that Ctot be always constant. Therefore, it is inevitable to switch some of the capacitors to make a new capacitance ratio needed for the next Vout. 2.
capacitor mismatch can induce many missing codes. The proposed capacitor array structure is based on the junction-splitting method as is efficient in terms of power consumption. To reduce the ...
The noise shaping (NS) pipelined successive approxi-mation register (SAR) ADC introduces pipelined operation and NS into the power-efficient SAR ADC to extend bandwidth and …
The statistical analysis of the standard deviation of INL and DNL versus different unit capacitance C 0 are analyzed (σ I N L $sigma _{INL}$ and σ D N L $sigma _{DNL}$) based on 1000 times Monte Carlo runs.The unit capacitor is modeled as a gaussian random variable with mean of C 0 and standard deviation of σ 0 [].Moreover, the ADC behavioral model is …
Most errors, except capacitor mismatch error, can be addressed owing to advances in circuit techniques and CMOS technologies [1,2,3,4,5]. However, capacitor mismatch significantly depends on the CMOS technology and requires special calibration circuitry to minimize the linearity degradation of the ADC output.
The proposed calibration circuit recursively amplifies the capacitor mismatch error by re-utilizing a multiplying digital-to-analog converter in a pipeline stage without increasing the circuit complexity, and the amplified …
The capacitor mismatch has been compensated by analog calibration techniques. In this work, a novel digital calibration method is developed for SAR ADC based on dithering. With dithering, weights ...
stage=0.1%, inter-stage gain error=1%, and capacitor mismatch d 2 of second stage=1%. Besides, dn of comparator''s noise is 1 mV and the input signal is a sinusoid with 1 V amplitude. In addition, the over-sampling rate is 8. 1000 times Monte–Carlo simulations are performed.
With 10% capacitor mismatch, ∼400,000 digital codes were collected to estimate W k. The fast Fourier transform plots of the ADC output spectrums before and after calibration are shown in Fig. 4. After calibration, …
The conversion accuracy of successive approximation register (SAR) analog-to-digital converter (ADC) is mainly affected by the capacitor mismatch. In this brief, a histogram-based calibration technique is proposed, which does not require any additional analog circuitry. In this work, the method of partial fitting is used to detect irregular code densities, and …
The capacitors C 1 = C 2 = C 3 = C 4 = 1 pF and C 5 = C 6 = 3.3 pF are implemented using metal-insulator-metal capacitors and dummy capacitors are placed around this capacitor bank to minimize the interference as well as mismatch. Also, the analog and digital layouts are separated by guard rings and distinct supply voltages are used to reduce ...
This paper presents an efficient modeling method for the effects of capacitor mismatches in SAR ADCs. As the capacitor mismatch can severely degrade accuracy, it is necessary to determine the limitation of the resolution. We statistically analyze the resolution of the SAR ADCs considering both the traditional approach and the proposed advanced analysis, and the …
At this point, if there is no capacitor mismatch, the voltage difference between the top and bottom plates of the capacitor should be an LSB voltage. However, due to process deviation, the voltage on the top plate may not be 1LSB, but there will be a slight deviation. The information of this voltage difference can be measured by TDC, to obtain ...
A novel digital calibration technique is proposed to calibrate the capacitor mismatch in SAR ADCs. The capacitor mismatches are extracted based on the comparator metastability and intrinsic noise.
Switching of capacitor and reactor banks with thyristor as a switch is obtained at transient free conditions so that the significant problem of switching harmonics is eliminated. The coarse ...
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