Design of a packaging-friendly double-topology RF MEMS switch for space applications

Microsystem Technologies - This article presents the results of the research, design and a series of manufacturing steps of an RF-MEMS switch to be used in space communication systems. Design and...     

RF MEMS packaged switch evaluation tests up to 25 GHz

This article presents the results of the series of experimental tests of a packaged RF MEMS switch manufactured as a chip on a silicon substrate in the Center for Materials and Microsystems of Fondazione Bruno Kessler. Experiments have been performed up to 25 GHz and included S-parameters check in different operation and environmental conditions, including variation of input power, ambient temperature and number of switching cycles. Presented RF MEMS SPST switch is a basic element of more complex reconfigurable networks such as SPxT switches, phase shifters, power attenuators etc.

     

Integration of functional elements of resistive nonvolative memory with 1T-1R topology

The issues related to the integration of functional elements of ReRAM memory based on resistive Pt/HfO₂/TiN structures with transistors fabricated by CMOS technology (0.18 μm node) are discussed when placing the memory cells in metallization layers. It is shown that the formation of a ReRAM stack can be organized as the “back end of line” (BEOL) process. The possibility is demonstrated of writing information in fabricated 1T-1R cells at the given levels of current determined by the voltage on the transistor, which allows one to choose the required values of resistance for the ON and OFF states. The presence of a transistor makes it possible to limit the power that is scattered in a resistance-switchable structure, and makes its parameters virtually insensitive to changes in the voltage of writing. The latter circumstance makes it possible to use the same recording voltage for all devices, which makes the problem of reproducing the values for different cells in an array less acute.     

Design and manufacturing of X-band RF MEMS switches

Microsystem Technologies - In this article, we present the results of the design of different geometries for X-band RF MEMS switches. A number of mechanical and RF optimizations are described along...     

Multicomponent intravenous and epidural anesthesia in aorto-coronary bypass surgery

The influence of epidural anesthesia (CEA) on clinical manifestations, cortisole and adrenocorticotropic hormone (ACTH) level, central hemodynamic values during aorto-coronary bypass surgery (ACBS) in 56 patients aged 42-68 years with preserved functional capacity of the myocardium was studied. Catheterisation of the epidural space was carried out in the evening before the operation according to the standard method at the level of T4-T5 with the use of disposable epidural set. During the procedure before perfusion 2% solution of lidocaine 3.8 +/- 0.2 mg/kg was introduced in epidural space (taking into account test-dose) as a bolus in 3-4 motions. The dose of local anesthetics for infusion was selected separately for each individual case with due regard for hemodynamic values. During artificial circulation additionally local anesthetic was introduced as a bolus, the dose being 4.7 +/- 0.8 mg/kg. At the end of the operation morphine (0.061 +/- 0.001 mg/kg) was introduced. It was established that combined application of intravenous and epidural anesthesia represents highly effective method of anesthesia in aorto-coronary bypass surgery. According to clinical course data, cortisone and ACTH blood contents and hemodynamic parameters, EA provides adequate anesthesia, promotes stabilization of hemodynamic values and creates functionally more advantageous conditions for the myocardium in patients with CHD during aorto-coronary bypass operation. Anesthesiologic aid with the use of EA promotes reduction of intravenous anesthetics expenditure, earlier waking up of the patients in postoperative period and decrease in duration of postoperative artificial lung ventilation.