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Sinusoidal RF DACs for undersampled LC bandpass ∑Δ modulabrs
2007 Edition, August 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, we present a systematic technique to design bandpass LC Sigma Delta modulators with sinusoidal feedback DACs. The output resistance of the DAC degrades the quality factor of the LC resonator and the DAC output capacitance modifies its...

A direct down converted low-jitter band pass delta sigma receiver with frequency translating technique and sinusoidal RF DAC
2012 Edition, December 1, 2012 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A direct-converted band pass delta sigma receiver (BPDSX) with a frequency translating technique incorporating the proposed sinusoidal RF DAC, which reduces noise power such as out of band harmonics and jitter noise, is proposed. The proofreading simulation successfully reveals...

A Fast Gradient-Based Iterative Algorithm for Undersampled Phase Retrieval
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This work develops a fast iterative shrinkagethresholding algorithm which can efficiently tackle the issue in undersampled phase retrieval. First, using the gradient framework and proximal regularization theory, the undersampled phase retrieval problem is formulated as an optimization...

Undersampled dynamic X-ray tomography with dimension reduction Kalman filter
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, we propose prior-based dimension reduction Kalman filter for undersampled dynamic X-ray tomography. With this method, the X-ray reconstructions are parameterized by a low-dimensional basis. Thus, the proposed method is a) computationally very light; and b) extremely...

Bayesian Reconstruction of Undersampled Multicoil Hardi
2019 Edition, September 1, 2019 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

High-angular-resolution diffusion imaging (HARDI) relies on multicoil acquisitions for clinical applications. HARDI scan time can be reduced by undersampling the set of gradient directions. Typical methods for undersampled HARDI reconstruction use two-stage schemes that first...

Frequency Estimator Based on Spectrum Correction and Remainder Sifting for Undersampled Real-valued Waveforms
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Frequency estimation of undersampled waveforms receives increasingly attentions in communication, radar signal processing, instrumentation and measurements etc. However, due to the lack of recognizing the correct remainder between two side spectra, the existing Chinese Remainder Theorem...

Supercompact and Ultrawideband Surface Plasmonic Bandpass Filter
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We propose a supercompact and ultrawideband (UWB) bandpass filter for spoof surface plasmonic polariton (SSPP) mode. By using meander-line technology, the electrical size of the proposed SSPP structure is reduced dramatically, which is only about 1/4 of the traditional...

Ultrasonic wave-speed diffraction tomography with undersampled data using virtual transducers
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Ultrasonic diffraction tomography (DT) offers a way to achieve high-resolution imaging of the wavespeed map, and hence has strong potential applications in medical diagnosis and Nondestructive evaluation (NDE). Ideal images can be obtained with a complete array of sensors surrounding the scatterer,...

Symmetrical Quasi-Absorptive RF Bandpass Filters
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A type of symmetrical RF bandpass filters (BPFs) with quasi-absorptive functionality are presented. They are composed of a bandpass section that is loaded at its input/output ports with nearly complementary resistively terminated bandstop sections. In this manner, the...

Frequency- and Bandwidth-Tunable Absorptive Bandpass Filter
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, an analytic design method for a frequency- and bandwidth-tunable absorptive bandpass filter is introduced. The presented design method relies on the transformation from the normalized absorptive low-pass filter prototype to a bandpass filter structure with...

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