Title:
RADIO SIGNAL RECEIVING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/050391
Kind Code:
A1
Abstract:
A radio signal receiving apparatus wherein an AGC control circuit is realized
which prevents the amplitudes of input signals to be supplied to a reception amplifier
and an A/D converter from being saturated even if the arrival time and/or reception
level of a burst signal is unknown. This apparatus includes two types of average
amplitude determining elements (102,106) that determines input and output
average amplitudes of a variable gain amplifier (101). A result of output average
amplitude determination by the first average amplitude determining element
(102) is used to cause the variable gain amplifier (101) to effect a variable gain
control. When a result of input signal amplitude determination by the second
average amplitude determining element (106) is lower than a reference value,
the reference value is used to cause the variable gain amplifier (101) to effect
a constant gain control. At this moment, switching from the variable gain control
to the constant gain control is effected by a switch (154).
Inventors:
TOUGOU HITOMARO
Application Number:
PCT/JP2006/321079
Publication Date:
May 02, 2008
Filing Date:
October 23, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
TOUGOU HITOMARO
TOUGOU HITOMARO
International Classes:
H04B1/16; H03G3/30
Foreign References:
| JPH04167629A | 1992-06-15 | |||
| JPH08288881A | 1996-11-01 | |||
| JPH0851330A | 1996-02-20 | |||
| JPH0795141A | 1995-04-07 | |||
| JPH0832384A | 1996-02-02 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (Shintoshicenter Bldg.24-1, Tsurumaki 1-chom, Tama-shi Tokyo, JP)
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