Tunable continuous-time bandpass /spl Sigma//spl Delta/ modulators with fractional delays

Sobot, Robert; Stapleton, S.P.; Syrzycki, M.

doi:10.1109/tcsi.2005.857085

Cited by 21 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bandwidth is 5MHz, and the resulting OSR is 8. According to (5), the optimum value for α and β is 0.113 and -0.113, respectively. Due to the finite resolution of the tuning capacitors, ±0.125 is used.…”

Section: Circuit Implementation and Simulation Resultsmentioning

confidence: 99%

“…However, it is not practical for a multistandard RF/IF receiver, which requires the modulator to be tunable and flexible. Tunable BP ΔΣ modulators using continuous-time loop filters have been reported [4] [5]. Although continuous-time approach is more suitable for highspeed operation, it is difficult to control the center frequency, and the tuning methods are much more complicated than those of the SC counterparts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A tunable SC bandpass delta-sigma modulator for multi-standard applications

Huang

2008

APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems

View full text Add to dashboard Cite

This paper presents a double-sampling switchedcapacitor (SC) tunable resonator for bandpass (BP) ΔΣ modulators. The resonator is implemented with a single opamp to reduce the power consumption. In addition, the resonant frequency can be easily tuned by controlling the number of shunting capacitors. Based on the resonator, a fourth-order BP ΔΣ modulator is proposed. With the tuning ability, the resonant frequencies of the two resonators in the modulator not only can be varied to the same center frequency for narrow-band applications, but also to the frequencies symmetric to the center frequency, one quarter of the sampling frequency, for wideband applications. The BP ΔΣ modulator is implemented in a 0.18μm CMOS technology, and Matlab and HSPICE simulation results are presented to demonstrate the design concept.

show abstract

Section: Circuit Implementation and Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A tunable SC bandpass delta-sigma modulator for multi-standard applications

Huang

2008

APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems

View full text Add to dashboard Cite

show abstract

“…The fourth order continuous-time bandpass Σ∆ modulator model used in this experiment is based on analytical formulas described in [15]. The analytical model allows for arbitrary tuning of the centre frequency over relatively wide tuning range, as well as compensation for the loop-delay.…”

Section: Signal Processing Systemmentioning

confidence: 99%

Steady–state visually evoked EEG signal processing with tuneable continuous–time bandpass sigma–delta modulators

Lele

Sobot

Waxer

et al. 2009

2009 European Conference on Circuit Theory and Design

View full text Add to dashboard Cite

We present a non-invasive brain-machine-interface (BMI) prototype system which allows the simple control of a switch. The main goal of the system, based on electroencephalogram (EEG) recordings, is to create mechanical action from brain activity. Experimental work presented in this paper outlines the operation of a system which is based on a tuneable continuoustime bandpass Σ∆ modulator used to detect the frequency signature of SSVEP waveforms. Simple time-frequency-space domain signal analysis methods are employed to generate the electrical control-signal, sufficient to control a robotic motion. Our simulation demonstrated around 90% success rate in decoding SSVEP activity.Index Terms-brain to machine interface, biomedical acoustics, signal processing.

show abstract

“…2 shows a model of the modulator. The design of the noise shaping filter H(s) is given in [3] for a non-return to zero (NRZ) feedback digital-to-analog converter (DAC) D f (s). A continuous-time pulse train p(t) is generated from the modulator by an NRZ output DAC D o (s), and in this model the feedback and output DAC's are identical.…”

Section: Bandpass σδ Modulatormentioning

confidence: 99%