Voltage controlled oscillators with ferroelectric capacitors

Kabir, A.; Jamil, Asad; Zhang, Yulan; Kalkur, T. S.

doi:10.1109/freq.2008.4623030

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…This BST-based material, Parascan™ is a doped version of BST and its specified minimum bias voltage is 1V [ 45 ]. These capacitors have already been used in other works such as that by Kabir in [ 43 ], which biased these varactors at voltages in the sub-one-volt range.…”

Section: Methodsmentioning

confidence: 99%

Current Progress towards the Integration of Thermocouple and Chipless RFID Technologies and the Sensing of a Dynamic Stimulus

2020

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To date, no printable chipless Radio Frequency Identification (RFID) sensor-related publications in the current literature discuss the possibility of thermocouple integration, particularly for the use in extreme environments. Furthermore, the effects of a time-dependent stimulus on the scattering parameters of a chipless RFID have never been discussed in the known literature. This work includes a review of possible methods to achieve this goal and the design and characterization of a Barium Strontium Titanate (BST) based VHF/UHF voltage sensing circuit. Proof-of-concept thermocouple integration was attempted, and subsequent testing was performed using a signal generator. These subsequent tests involved applying ramp and sinusoid voltage waveforms to the circuit and the characteristics of these signals are largely extracted from the scattering response. Overall conclusions of this paper are that thermocouple integration into chipless RFID technology is still a significant challenge and further work is needed to identify methods of thermocouple integration. With that being said, the developed circuit shows promise as being capable of being configured into a conventional chipless RFID DC voltage sensor.

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Section: Methodsmentioning

confidence: 99%

Current Progress towards the Integration of Thermocouple and Chipless RFID Technologies and the Sensing of a Dynamic Stimulus

2020

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“…Ferroelectric capacitors like BST have been used to reduce components in wireless technologies [1][2][3][4][5][6][7] for their unique properties such as high permittivity, tunability, and relatively low loss compared to other varactors. In order to effectively change the load impedance of the output stage to transfer maximum power, tunable matching networks are required for RF amplifiers.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric Capacitor Based Adaptive Matching Network for Rf Amplifier

Zhang

Kalkur

Mulcahy

2010

Integrated Ferroelectrics

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This paper presents the design and characterization of an adaptive matching network which is made of thin-film barium-strontium-titanate (Ba 0.7 Sr 0.3 TiO 3 (BST)) for a class A RF amplifier. 10 dB gain has been achieved and maximum output power load performance of tunable amplifier is improved compared to fixed-impedance amplifier. Control bias variation of 3 V results in about 10 dB gain difference at 700 MHz. By applying 3 V on the ferroelectric capacitor, f −3dB is 658 MHz which is shifted by 123 MHz compared to at 0 volts. It provides the adaption for frequency bands of 400, 500 and 600 MHz and different power levels.

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Characterization of Catalysts by Advanced Scanning Probe Microscopy and Spectroscopy

Sun

Zeng

2020

ChemCatChem

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Considering that there is a shortage of sustainable resources and that serious environmental issues need to be solved, the development of efficient catalysts has attracted a lot attention globally for energy saving and environmental improvement. In the last few decades, great progresses have been made in terms of fabrication and application of catalysts, however, systematic characterization with advanced technology and methods that enable researchers to have a detailed understanding of the catalysts’ properties and catalytic reactions, especially where an interface is present, are still limited. This Review focusses on the applications of advanced Scanning Probe Microscopy (SPM) and Spectroscopy techniques for the characterization of catalytic materials and their related reactions. A detailed description of advanced SPM and Spectroscopy techniques is introduced, followed by their applications in the characterization of surfaces and properties of common ordered catalytic materials including some coordination polymers and metal oxides. Various properties of these catalytic materials, such as conductivity, piezoelectricity, nanomechanics, photoresponse, and others, characterized by SPM and Spectroscopy are discussed. Subsequently, we introduce the high‐resolution imaging of chemical reactions and bond configuration by high‐resolution non‐contact Atomic Force Microscopy (NC‐AFM). Finally, the challenges involved in the development of SPM and Spectroscopy and an outlook for future research are presented. This Review provides fundamental insights into the characterization of heterogeneous catalysts and viewpoints to the development of smart catalytic materials.

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Voltage controlled oscillators with ferroelectric capacitors

Cited by 6 publications

References 10 publications

Current Progress towards the Integration of Thermocouple and Chipless RFID Technologies and the Sensing of a Dynamic Stimulus

Current Progress towards the Integration of Thermocouple and Chipless RFID Technologies and the Sensing of a Dynamic Stimulus

Ferroelectric Capacitor Based Adaptive Matching Network for Rf Amplifier

Characterization of Catalysts by Advanced Scanning Probe Microscopy and Spectroscopy

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