2 edition of Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping found in the catalog.
Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping
Written in English
|Statement||by Tao Shui.|
|The Physical Object|
|Pagination||124 leaves, bound :|
|Number of Pages||124|
The BANDPASS_FILTER function applies a lowpass, bandpass, or highpass filter to a one-channel image. A bandpass filter is useful when the general location of the noise in the frequency domain is known. The bandpass filter allows frequencies within the chosen range through and attenuates frequencies outside of the given range. Hi all! Im currently writing a bachelor's thisis on the difference between the old R2-R based DACs and the now more common Delta Sigma DAC. Many seem to prefer the old R2-R DAC over the Delta-Sigma, and my aim is to, with the help of advance audio-analyzing tools, to try and look at what might be the reason for this.
A new technique for designing an LC bandpass Delta-Sigma modulator is presented. This method is based on pulse shaping of a DAC output signal such that one can realize a desired (arbitrary) loop transfer function. Espe-cially for higher-order modulators where extra LC sections are added, sufﬁcient number of parameters are provided in the. A continuous time delta-sigma analog to digital converter is disclosed. A summing junction receives an input analog signal to be digitized and a feedback signal. A loop filter receives the combined signals from the summing junction, and a course analog to digital converter converts the combined signal to a multi-bit digital number. A sin DAC provides a feedback signal to the summing junction.
A bandpass X A modulator typically has even order, so a modification of a fifth-order lowpass modulator could produce only a second or fourth-order modulator. As the original IC contained dual fifth-order modulators, identical fourth-order bandpass modulators were implemented on the IC, one in each of the existing channels. frequency . In contrast, bandpass DSMs employ resonators to obtain the bandpass-type noise shaping properties. Figure 1 shows block diagrams of a conventional 2nd-order lowpass DSM (a) and a 4th-order bandpass DSM (b). The lowpass DSM shown in Fig. 1(a) consists of two integrators with a transfer function z-1/(1 - z-1). Since = + + +L.
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Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping. Download PDF (6 MB) Abstract. Graduation date: Delta-sigma modulators are currently a very popular technique for making high-resolution\ud analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).\ud These oversampled data converters have.
Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping Public Deposited. a current-mode unit element DAC is designed and used as a test bed. Both theoretical analysis and experimental results show that these methods can greatly attenuate the noise in the band of interest.
The methods presented in this thesis will Author: Tao Shui. Lowpass and Bandpass Current-Mode Delta-Sigma DACs Employing Mismatch-Shaping by Tao Shui A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Completed May 8, Commencement June A simple bandpass mismatch noise-shaping technique for Σ-Δ modulators is presented.
This technique uses the data-directed scrambler structure and achieves ∼20 dB improvement in signal-to-noise. In this paper, mismatch-shaping techniques for low-pass delta-sigma (ΔΣ) modulators are reviewed, and a mismatch-shaping technique for bandpass ΔΣ modulators is described.
Delta-Sigma DAC and the second for the case of Current Mode Multibit Delta-Sigma DAC. Butterﬂy Shuﬂer is the best structure for a bandpass mismatch shaped multibit Delta-Sigma switched-capacitor DAC. Its ﬁrst order has been used by , [ 2 ].
A second order of it is presented next by  16 element switch capacitors ( um technology. Mismatch‐Shaping.
Chapter. Mar ; Delta‐Sigma DACs. Chapter. Mar A sixth-order dc-to-1 GHz tunable continuous-time lowpass/bandpass Delta Sigma ADC in nm CMOS targeting RF. The equivalent continuous-time lowpass delta-sigma mod-ulator shown in Fig.
The simulated output spectrum of the continuous-time frequency-translating bandpass delta-sigma modulator is shown in Fig. 3 DAC Jitter Performance In a conventional lowpass delta-sigma, the feedback signal is usually a rectangular current pulse, Fig.
6, the. Shui, R. Schreier and F. Hudson, "Mismatch-shaping DAC for lowpass and bandpass multi-bit delta-sigma modulators," Proceedings, IEEE International Symposium on Circuits and Systems, vol. 1, pp.Monterey, CA May June 3 Simulations are presented for different 6th and 4th-order bandpass mismatch-shaping circuit, moved inside the feedback loop of a 6th-order bandpass delta-sigma modulator.
However, it can also be. A Flexible Continuous-Time $\Delta \Sigma $ ADC With Programmable Bandwidth Supporting Low-Pass and Complex Bandpass Architectures Abstract: A flexible continuous-time ΔΣ modulator that supports both low-pass and complex bandpass (CBP) architectures with the programmable bandwidths of 5 and 10 MHz is presented.
Abstract: A second-order multi-bit quadrature bandpass continuous-time delta-sigma modulator (QBP-CTDSM) employing a power-scaling technique (PST) and a quadrature mismatch scrambler (QMS) for a tri-mode GSM-EDGE/UMTS/DVB-T low-IF receiver is reported in this paper.
This modulator employs operational amplifiers with PST to optimize power consumption among the tri. DAC mismatch shaping can scale with OSR in a manner similar to quantization noise shaping.
Moreover, the technique lends itself to high-speed logic because it requires no randomization. Fig. Second-order ΣΔmodulator with DAC mismatch shaping. Fig.
Front end of ﬁrst modulator. Issues The architecture in Fig. 4 entails a number of. The mismatch-shaping DEM was introduced and applied to the 4-bit DACs in this paper to improve the resolution and linearity of the ADC.
Fabricated in a μm CMOS process with single V supply voltage, the converter achieves a peak SNDR of dB over a 10 MHz bandwidth which implies an effective number of bits (ENOB) of bit. Abstract: A new analysis and synthesis method for continuous time bandpass Delta-Sigma (/spl Delta//spl Sigma/) modulators is presented in this paper.
This method makes it possible to synthesize continuous bandpass /spl Delta//spl Sigma/ modulators from discrete time topologies and it takes into account DAC+ADC delay and rise time.
Before proving the correctness of this relation we illustrate the method with the response of Fig. We can pick any positive frequency f 0 in the region of support of X(f) and associate x(t) with a low-pass signal x ~ (t).For example, picking f 0 as shown in the figure, and applying the definition () we find that the Fourier transform of the complex equivalent signal is shown in Fig.
Gagnon, G., MacEachern, L.: Continuous Compensation of Binary-Weighted DAC Nonlinearities in Bandpass Delta-Sigma Modulators. In: IEEE International Symposium on Circuits and Systems, ISCASpp.
– () Google Scholar. For many years only the sensing element has been used as a low-pass noise shaping filter within the ΣΔ modulator.Recent publications report the use of additional electronic low-pass filters (LPF) to further improve the noise shaping behavior.Since the output characteristic of a gyroscope is a narrow-band amplitude modulated signal at the drive frequency a bandpass noise shaping filter.
Theory of lowpass and bandpass sigma-delta modulation Abstract: One-bit oversampled or sigma-delta analogue-to-digital conversion has been the subject of much research attention in recent years, finding use in a wide variety of applications.
Theoretical analysis of this conversion method has been complicated by its nonlinear nature, precluding. Delta-sigma (ΔΣ; or sigma-delta, ΣΔ) modulation is a method for encoding analog signals into digital signals as found in an analog-to-digital converter (ADC).
It is also used to convert high bit-count, low-frequency digital signals into lower bit-count, higher-frequency digital signals as part of the process to convert digital signals into analog as part of a digital-to-analog converter (DAC).
III. Bandpass Modulator Implementation The system diagram of the proposed voltage-mode bandpass ∆Σ modulator structure is shown in Figure 2. This fourth-order modulator is based on the low-distortion architecture proposed by Silva et al. . In this implementation the input is sampled by the first stage capacitors.
The DAC feedback signal.Abstract: The traditional low-pass sigma-delta (Sigma Delta) analog-to-digital converter is extended to the bandpass case.
For input signals with small relative bandwidths, bandpass Sigma Delta converters offer high signal-to-noise ratios at significantly lower sampling rates than are required for low-pass Sigma Delta converters.The modulator acts as a low-pass filter to the signal, converting it to a high-speed bit stream that is fed into a 1 bit DAC.
T. Shui et al., Mismatch shaping for a current-mode multibit delta-sigma DAC, IEEE J. Solid-State Circuits, 34(3), –, Skewless differential switch and DAC employing the same, U.S. Patent.