VARIABLE ATTENUATOR, AND WIRELESS COMMUNICATION DEVICE

PROBLEM TO BE SOLVED: To provide a variable attenuator, used with high frequency, in which variable attenuation per stage is large. SOLUTION: The variable attenuator includes: a MOSFET 12 having a gate, a drain, a source, and a body; an attenuation control circuit 14; and a temperature compensation...

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Bibliographic Details
Main Authors MIYAZAKI TAKAHITO, NAKATANI TOSHIBUMI
Format Patent
LanguageEnglish
Published 02.04.2009
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
TRANSMISSION
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Summary:PROBLEM TO BE SOLVED: To provide a variable attenuator, used with high frequency, in which variable attenuation per stage is large. SOLUTION: The variable attenuator includes: a MOSFET 12 having a gate, a drain, a source, and a body; an attenuation control circuit 14; and a temperature compensation circuit 21. The attenuation control circuit 14 supplies a control voltage to the gate, the drain, and the source. The temperature compensation circuit 21 supplies a temperature compensation voltage to the body. An input terminal and an output terminal are connected to the drain and the source of a MOSFET 12. The temperature characteristics compensation circuit 21, in accordance with an operating temperature of the MOSFET 12, controls a voltage to be supplied to the body and adjusts, based on a relation between a body voltage and a gate voltage, a resistance value of a current flowing between the input terminal and the output terminal. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20080210314