Title:
ELECTRIC CIRCUIT DEVICE
Document Type and Number:
Japanese Patent JP3685214
Kind Code:
B2
Abstract:
PURPOSE: To stabilize operation of an amplifier, by reducing a mutual coupling in coil components between an input-side coupling circuit and an output-side coupling circuit connected to an input or output side of the amplifier in a receiving circuit of a telephone.
CONSTITUTION: An input-side coupling circuit 19 connected to a front stage of an amplifier 16 and an output-side coupling circuit 25 connected to a rear stage of the amplifier 16 are mounted oppositely on each side of a circuit board 15. Ground pattern 20 and 26 that correspond to the input-side coupling circuit 19 or the output-side coupling circuit 25 are formed in a way that the mutual coupling is reduced by a shield effect of the ground patterns 20 and 26.
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Inventors:
Hiroshi Shinohara
Application Number:
JP14261695A
Publication Date:
August 17, 2005
Filing Date:
May 17, 1995
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H05K1/16; H05K1/02; (IPC1-7): H05K1/16; H05K1/02
Domestic Patent References:
| JP61102068U | ||||
| JP4304705A | ||||
| JP2260701A |
Attorney, Agent or Firm:
Osamu Matsumura
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