Tunable Dielectrics for RF Circuits
نویسنده
چکیده
In most electronic materials the change in dielectric constant with applied electric field is an effect too small to be useful or even easily measurable. But for a special class of highpermittivity materials the effect can be quite pronounced. This chapter explores some challenges and opportunities for exploiting tunable dielectrics to make reconfigurable, adaptive, frequency-agile RF devices. We will focus on thin-film barium strontium titanate (BST) materials, discuss design and modeling of BST varactors, and survey some circuit implementations and heterogeneous integration efforts.
منابع مشابه
Second Harmonic Reduction of Traveling Wave Tube Amplifier Using Ferrite Material
Traveling Wave Tubes (TWTs) consist of different elements. The most important element of TWT is the RF circuit. RF circuits in helix TWTs need a dielectric support to hold the helix; this support also has an effect in electromagnetic properties of RF circuits. A novel dielectric support is proposed to reduce the second harmonic of helix TWTs. The dielectric support in this structure consists of...
متن کاملTunable Threshold Voltage of Organic CMOS Inverter Circuits by Electron Trapping in Bilayer Gate Dielectrics
متن کامل
RF MEMS Switches and Integrated Switching Circuits
Radio frequency (RF) microelectromechanical systems (MEMS) have been pursued for more than a decade as a solution of high-performance on-chip fixed, tunable and reconfigurable circuits. This paper reviews our research work on RF MEMS switches and switching circuits in the past five years. The research work first concentrates on the development of lateral DC-contact switches and capacitive shunt...
متن کاملEmbedded RF Test Circuits: RF Power Detectors, RF Power Control Circuits, Directional Couplers, and 77-GHz Six-Port Reflectometer
Modern integrated circuits (ICs) are becoming an integrated parts of analog, digital, and radio frequency (RF) circuits. Testing these RF circuits on a chip is an important task, not only for fabrication quality control but also for tuning RF circuit elements to fit multi-standard wireless systems. In this paper, RF test circuits suitable for embedded testing are introduced: RF power detectors,...
متن کامل