High-Frequency Circuit Design and Measurements

Yip, Peter C. L.

doi:10.1007/978-94-011-6950-9

Cited by 22 publications

(2 citation statements)

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“…The signal measured at the probe input is then the sum of both incident voltage wave injected into the line plus the reflected voltage wave being reflected back from the load. In order to measure return loss we need to isolate the reflected voltage wave from the incident voltage wave using an RF bridge [24], shown conceptually in Fig. 5 where the AD8307 takes the role of the RF detector.…”

Section: Test Instrument Designmentioning

confidence: 99%

A Low-Cost Instrument for Estimating the Starch Content of Cassava Roots Based on the Measurement of RF Return Loss

Odedeyi

Liu

Kassem

et al. 2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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The problem of simply and reliably estimating starch content of cassava roots in the field is addressed by the development of a low cost test instrument that measures return loss at radio frequencies using a coaxial probe. A clear relationship between starch content of cassava roots and the measured return loss of root samples at a specific frequency of 30 MHz is first verified experimentally. A prototype test instrument is then designed with goals of portability, low cost and simplicity of use. The test instrument displays starch content in 5 categories, from "low" to "high" using an array of 5 LEDs. The performance of the test instrument is experimentally verified in the field and a reliable correlation between cassava root starch content and LED indication is demonstrated.

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Section: Test Instrument Designmentioning

confidence: 99%

A Low-Cost Instrument for Estimating the Starch Content of Cassava Roots Based on the Measurement of RF Return Loss

Odedeyi

Liu

Kassem

et al. 2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…As the signal frequency increases to a few tens of megahertz and up, the wavelength becomes comparable to the size of the circuit implying that the voltage and current are no longer spatially uniform through the circuit [95]. The signals should be analyzed as propagating waves that are partially reflected back and forth between any two connections in the circuit.…”

Section: High Frequency Measurementsmentioning

confidence: 99%

Addressability and GHz Operation in Flexible Electronics

Sani

2016

Linköping Studies in Science and Technology. Dissertations

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The first principle is that you must not fool yourself and you are the easiest person to fool. -Richard FeynmanThe discovery of conductive polymers in 1977 opened up a whole new path for flexible electronics. Conducting polymers and organic semiconductors are carbon rich compounds that are able to conduct charges while flexed and are compatible with low-cost and large-scale processes including printing and coating techniques. The conducting polymer has aided the rapidly expanding field of flexible electronics, leading to many new applications such as electronic skin, RFID tags, smart labels, flexible displays, implantable medical devices, and flexible sensors.However, there are several remaining challenges in the production and implementation of flexible electronic materials and devices. The conductivity of organic conductors and semiconductors is still orders of magnitude lower compared to their inorganic counterparts. In addition, non-flexible inorganic semiconductors still remain the materials of choice for high frequency applications; since the charge carrier mobility and thus operational speed of the organic materials are limited. Therefore, there remains a high demand to combine the high frequency operation of inorganic semiconductors with the flexible fabrication methods of organic systems for future electronics.In addition to the challenges in the choice of materials in flexible electronics, the upscaling of the flexible devices and implementing them in circuits can also be complicated. Lack of non-linearity is an issue that arises when flexible devices with linear behavior need to be incorporated in an array or matrix form. Non-linearity is important for applications such as displays and memory arrays, where the devices are arranged as matrix cells addressed by their row and column number. If the behavior of cells in the matrix is linear, addressing each cell affects the adjacent cells. Therefore, inducing non-linearity and, consequently, addressability in such linear devices is the first step before scaling up into matrix schemes.In this work, non-linear organic/inorganic hybrid devices are produced to overcome the limitations mentioned above and leverage the advantages of both organic and inorganic materials. Two novel methods are developed to incorporate non-flexible inorganic semiconductors into ultra-high frequency (UHF) flexible devices. In the first method, Si is ground into a powder with micrometer-sized particles and printed through standard screen printing. For the first time, allprinted flexible diodes operating in the GHz range are produced. The energy harvesting application of the printed diodes is demonstrated in a flexible circuit coupling an antenna and the display to the diode.A second and simpler room-temperature method based on lamination was later developed, which further improves device performance and operational frequency. Here, a flexible semiconducting composite film consisting of Si microparticles, glycerol, and nano-fibrillated cellulose is produced and used as the semiconduct...

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Transistor and Component Models at Low and High Frequencies

Everard

2001

Fundamentals of RF Circuit Design

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High-Frequency Circuit Design and Measurements

Cited by 22 publications

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A Low-Cost Instrument for Estimating the Starch Content of Cassava Roots Based on the Measurement of RF Return Loss

A Low-Cost Instrument for Estimating the Starch Content of Cassava Roots Based on the Measurement of RF Return Loss

Addressability and GHz Operation in Flexible Electronics

Transistor and Component Models at Low and High Frequencies

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