A QPLL-timed direct-RF sampling band-pass ΣΔ ADC with a 1.2 GHz tuning range in 0.13 µm CMOS

2011 ◽  
Author(s):  
Subhanshu Gupta ◽  
Daibashish Gangopadhyay ◽  
Hasnain Lakdawala ◽  
Jacques C. Rudell ◽  
David J. Allstot
Keyword(s):  
Tuning Range ◽  
Band Pass ◽  
Rf Sampling

scholarly journals Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Bowen Zhang ◽  
Nuo Chen ◽  
Xinda Lu ◽  
Yuhang Hu ◽  
Zihao Yang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Tuning Range ◽  
Extinction Ratio ◽  
Optical Filter ◽  
Optimized Design ◽  
Coupling Coefficients ◽  
Large Bandwidth ◽  
Time Symmetry ◽  
Bandwidth Tuning ◽  
Band Pass

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

High-tuning-range CMOS band-pass IF filter based on a low-Qcascaded biquad optimization technique

2014 ◽  
Vol 43 (11) ◽  
pp. 1615-1636 ◽  
Author(s):  
Pietro Monsurrò ◽  
Salvatore Pennisi ◽  
Giuseppe Scotti ◽  
Alessandro Trifiletti
Keyword(s):  
Tuning Range ◽  
Optimization Technique ◽  
Band Pass

scholarly journals Microwave Magnetoelectric Devices

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
A. S. Tatarenko ◽  
M. I. Bichurin
Keyword(s):  
Phase Shift ◽  
Phase Shifter ◽  
Tuning Range ◽  
Frequency Region ◽  
Band Pass Filter ◽  
Maximum Phase ◽  
Pass Filter ◽  
Band Pass ◽  
Insertion Losses ◽  
Theory And Experiment

Tunable microwave magnetoelectric devices based on layered ferrite-ferroelectric structures are described. The theory and experiment for attenuator, band-pass filter and phase shifter are presented. Tunability of the ME devices characteristics can be executed by application of an electric field. This electric tuning is relatively fast and is not power-consuming. The attenuator insertion losses vary from 26 dB to 2 dB at frequency 7251 MHz. The tuning range of 25 MHz of band-pass filter at frequency 7360 MHz was obtained. A maximum phase shift of 30–40 degree at the frequency region 6–9 GHz was obtained.

scholarly journals Unique Analysis Approach to Bridge-T Network using Floating Admittance Matrix Method”

2021 ◽  
Vol 15 ◽  
pp. 1297-1304
Author(s):  
Sanjay Kumar Roy ◽  
Brahmadeo Prasad Singh ◽  
Kamal Kumar Sharma ◽  
Cherry Bhargava
Keyword(s):  
Mathematical Modeling ◽  
Tuning Range ◽  
Transfer Functions ◽  
Large Network ◽  
Wide Tuning Range ◽  
Admittance Matrix ◽  
The Matrix ◽  
Band Pass ◽  
Time And Energy ◽  
Network Form

The RC bridge-T Circuit are sometimes preferred for radio frequency applications as it does not require transformer (inductive coupling). The uses of the resistance-capacitance form of the network permits a wide tuning range. The article aims to develop a band pass filter's mathematical model using the Floating Admittance Matrix (FAM) approach. Both types of RC bridge-T network form the band-pass filters. The use of the conventional methods of analysis such as KCL, KVL, Thevenin's, Norton's depends on its suitability for the type of the particular circuit. The proposed mathematical modeling scheme using the floating admittance matrix approach is unique, and the same can be used for all types of circuits. This method is suitable to use the partitioning technique for large network. The sum property of all the elements of any row or any column equal to zero provides the assurance to proceed further for analysis or re-observe the very first equation. This saves time and energy. The FAM method presented here is so simple that anybody with slight knowledge of electronics but understating the matrix maneuvering, can analyze any circuit to derive all types of its transfer functions. The mathematical modeling using the FAM approach provides leverage to the designer to comfortably adjust their design at any stage of analysis. These statements provide compelling reasons for the adoption of the proposed process and demonstrate its benefits. The theoretically obtained equations meet the expected result for the RC bridge-T network. Its response peaks at the theoretically obtained value of the frequency. The simulated results are in agreement with the topological explanations and expectations.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

DNA sequence mapping in interphase and metaphase chromosomes by fluorescence in situ hybridization

1992 ◽  
Vol 50 (1) ◽  
pp. 496-497
Author(s):  
Barbara Trask ◽  
Susan Allen ◽  
Anne Bergmann ◽  
Mari Christensen ◽  
Anne Fertitta ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Dna Sequence ◽  
Dna Sequences ◽  
Dual Band ◽  
Nick Translation ◽  
Metaphase Chromosomes ◽  
Band Pass ◽  
Texas Red ◽  
Fluorescent Spot

Using fluorescence in situ hybridization (FISH), the positions of DNA sequences can be discretely marked with a fluorescent spot. The efficiency of marking DNA sequences of the size cloned in cosmids is 90-95%, and the fluorescent spots produced after FISH are ≈0.3 μm in diameter. Sites of two sequences can be distinguished using two-color FISH. Different reporter molecules, such as biotin or digoxigenin, are incorporated into DNA sequence probes by nick translation. These reporter molecules are labeled after hybridization with different fluorochromes, e.g., FITC and Texas Red. The development of dual band pass filters (Chromatechnology) allows these fluorochromes to be photographed simultaneously without registration shift.

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