摘要:
A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency. A negative resistance circuit configured to drive the resonator, has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
摘要:
A first insulating layer is formed on first wiring and thereafter an etching resistant film is formed thereon. A lower layer portion of a second insulating layer is formed on the etching resistant film. Upon etching for forming dummy trenches, the rate of etching of the etching resistant film is less than or equal to one-tenth the rate of etching of the insulating layer. Therefore, the etching resistant film functions as an etching stopper and the etching thereof does not proceed to the first insulating layer. Thus, the interval between the corresponding first wiring and a second wiring can be reliably maintained and an increase in parasitic capacitance is hence prevented. An insulator lying within a wiring section is made unnecessary while a dishing phenomenon is prevented, by bottom-up filling of a copper-plated film due to the dummy trenches. Thus, wiring resistance is prevented from increasing.
摘要:
A thin film dielectric device is disclosed, that comprises a substrate, a lower electrode formed on the substrate and composed of a laminate film having columnar grains that have grown in a vertical to a surface of the substrate, a dielectric thin film formed on the lower electrode and composed of a perovskite oxide, the dielectric thin film being a polycrystalline film having columnar grains that have successively grown from the columnar grains of the lower electrode and that takes over a crystal orientation of the lower electrode, the lattice constant of the lower electrode being matched with the lattice constant of the dielectric thin film at the interface therebetween with the columnar grains, and an upper electrode formed on the dielectric thin film. The lattice matching of the columnar grains solves problems of the increase of the leak current of the thin film dielectric device and the degradation of the dielectric breakdown resistance. In addition, the polycrystalline film having the columnar grains that succeed at the interface of the electrode/dielectric thin film can be properly formed on the semiconductor substrate such as Si substrate. Thus, the thin film dielectric device according to the present invention can be applied to a real LSI circuit and so forth.
摘要:
A semiconductor memory device having a semiconductor substrate, an insulating layer provided on the substrate, and a memory cell. The memory cell has a switching transistor provided on the substrate and a charge storage element in a trench made in the insulating layer. The charge storage element has a bottom electrode, a dielectric layer and a top electrode deposited one on another in the order mentioned.
摘要:
A semiconductor memory device has a plurality of memory cells arranged in a matrix format. Each memory cell includes a thin film capacitor with a ferroelectric film and a pair of electrodes opposing each other through the ferroelectric film, and a transfer gate MOS transistor arranged to be connected to the thin film capacitor. The operating voltage value corresponding to the central axis of the polarization hysteresis characteristic curve of the thin film capacitor shifts from 0V by Vf. When no write or read operation is performed for the memory cell, the transistor is turned on, and an adjustment voltage set to be from 0 to 2 Vf is constantly applied across the electrodes of the thin film capacitor.
摘要:
A capacitor having a first electrode and a dielectric material epitaxially deposited on a surface of the electrode to form a dielectric layer on the electrode. The dielectric material forming the dielectric layer has induced strain in the layer sufficient to significantly improve the dielectric properties. A second electrode is placed on the dielectric layer.
摘要:
A semiconductor device according to an embodiment has: a semiconductor substrate; an acoustic resonator formed on the semiconductor substrate, having a semiconductor layer including impurity electrically isolated from the substrate by depletion layer and configured to resonate at a predetermined resonance frequency based on acoustic standing wave excited in the semiconductor layer; a temperature detector formed on the semiconductor substrate and configured to detect temperature of the semiconductor substrate; a calculating unit formed on the semiconductor substrate and configured to perform calculation of temperature compensation based on the temperature detected by the temperature detector, kind of the impurity and concentration of the impurity; and a controller formed on the semiconductor substrate and configured to control the resonance frequency based on a result of the calculation by the calculating unit.
摘要:
A piezoelectric-driven MEMS device can be fabricated reliably and consistently. The piezoelectric-driven MEMS device includes: a movable flat beam having a piezoelectric film disposed above a substrate with a recessed portion such that the piezoelectric film is bridged over the recessed portion, piezoelectric drive mechanisms disposed at both ends of the piezoelectric film and configured to drive the piezoelectric film, and a first electrode disposed at the center of the substrate-side of the piezoelectric film, and a second electrode disposed on a flat part of the recessed portion of the substrate and facing the first electrode of the movable flat beam.
摘要:
A semiconductor device includes a first transistor unit including first field effect transistors with first gate electrodes electrically connected together, first sources electrically connected together, and first drains electrically connected together, the first gate electrodes being electrically connected to the first drains, a second transistor unit including second field effect transistors with second gate electrodes electrically connected together, second sources electrically connected together, and second drains electrically connected together, the second gate electrodes being electrically connected to the first gate electrodes, and dummy gate electrodes electrically isolated from the first gate electrodes and the second gate electrodes. The first gate electrodes, the second gate electrodes, and the dummy gate electrodes are arranged parallel to one another, and at least one dummy gate electrode is located between any one of the first gate electrodes and any one of the second gate electrodes.
摘要:
A semiconductor device includes a semiconductor substrate, a first electrode that is formed over said semiconductor substrate, a capacitive insulating film that is formed on the first electrode and is made of a metal oxide ferroelectric, a second electrode that is formed on the capacitive insulating film, an insulating film that has a first opening exposing a portion of an upper side of the second electrode and is formed so that it covers the first electrode, the capacitive insulating film, and the second electrode, a first barrier film having an amorphous structure which is formed inside the first opening and on the insulating film, and a wiring film that is formed over the first barrier film.