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Title:
INPUT CIRCUIT FOR BS TUNER
Document Type and Number:
Japanese Patent JPH05335988
Kind Code:
A
Abstract:

PURPOSE: To suppress a leakage of a local oscillation signal from an input terminal in the input circuit of the BS tuner selecting and receiving a 1st intermediate frequency of a satellite broadcast.

CONSTITUTION: A series resonance circuit comprising a very small inductor 4 and a very small capacitor 5 is arranged between an earth and a connecting point between an input terminal 1 of a BS tuner and an input filter 2. Thus, a local oscillation signal invaded directly or indirectly to the input terminal 1 or the input filter 2 is suppressed for a local oscillation frequency band in which a leakage level is most increased and a leakage of the local oscillation signal travelled, through a signal path, which is not sufficiently attenuated only a reverse direction transmission characteristic of a broad band amplifier 3 is simultaneously suppressed.


Inventors:
IMAMURA SHIGEMI
SUGANUMA MASAHIKO
UMEMURA YOSHIHARU
YOKOUCHI KATSUMASA
Application Number:
JP14395792A
Publication Date:
December 17, 1993
Filing Date:
June 04, 1992
Export Citation:
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Assignee:
HITACHI LTD
HITACHI VIDEO & INF SYST
International Classes:
H04B1/08; H04B1/18; (IPC1-7): H04B1/18; H04B1/08
Attorney, Agent or Firm:
Ogawa Katsuo



 
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