Variable-capacitance element, method for adjusting variable-capacitance element, variable-capacitance device and electronic apparatus

A technology of variable capacitance and capacitive elements, which is applied in the direction of variable voltage capacitors, capacitors, circuits, etc., can solve problems such as not suitable for high-power applications, and achieve the effect of correcting deviation or tuning frequency offset

Inactive Publication Date: 2011-01-12
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These components allow only small currents (microamperes) and are not suitable for high power applications

Method used

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  • Variable-capacitance element, method for adjusting variable-capacitance element, variable-capacitance device and electronic apparatus
  • Variable-capacitance element, method for adjusting variable-capacitance element, variable-capacitance device and electronic apparatus
  • Variable-capacitance element, method for adjusting variable-capacitance element, variable-capacitance device and electronic apparatus

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Embodiment Construction

[0080] The variable capacitance element according to the present invention is a writable variable capacitance element whose capacitance can be rewritten, and is also a nonvolatile variable capacitance element whose capacitance, once written, can be maintained when no voltage is applied. As will be described later, when a variable capacitance device including a variable capacitance element according to the present invention is built into electronic equipment, the capacitance of the variable capacitance element can also be corrected after completion of the electronic equipment.

[0081] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0082] [Method of adjusting variable capacitance element]

[0083] First, a method of adjusting a variable capacitance element according to the present invention will be described.

[0084] figure 1 A schematic configuration of a variable capacitive element for use in one embodiment of th...

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Abstract

Provided is a variable-capacitance element wherein a desired capacitance value which corresponds to a write voltage can be freely set and a capacitance value which has been set before is maintained even when there is no write voltage. A method for adjusting the variable-capacitance element, a variable-capacitance device and an electronic apparatus are also provided. In a variable-capacitance element (100), a pair of electrodes (101, 102) are formed with a ferroelectric material layer (103) in between. The variable-capacitance element is adjusted by a step of maximizing or minimizing the sum of electric dipole moments of the ferroelectric material layer (103), and a step of writing a capacitance value by applying a desired write voltage (V) to the electrodes (101, 102) of the variable-capacitance element (100), in which the sum of the electric dipole moments of the ferroelectric material layer (103) is maximized or minimized, so that the variable-capacitance element (100) has a desired capacitance value.

Description

technical field [0001] The present invention relates to a nonvolatile variable capacitance element whose capacitance changes with a given write voltage and is maintained after the write voltage is removed. The invention also relates to a method of adjusting the variable capacitance element, a variable capacitance device and an electronic device. Background technique [0002] Generally, in order to control frequency, time, etc., variable capacitance diodes (varactor diodes), MEMS, etc. have been commercialized and widely used. These components allow only small currents (in the microampere range) and are not suitable for high power applications. However, the present inventors have proposed a variable capacitance element including a ferroelectric material that allows a large current to pass. [0003] For example, Patent Document 1 below describes a variable capacitor having an electrode structure with improved reliability and productivity in which a titanate system is used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G7/06
CPCH01G7/06H01L28/60H01L28/55
Inventor 管野正喜羽生和隆渡边诚横田敏昭
Owner SONY CORP
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