Down converter using C/N ratio correcting circuit of base...

Details Down converter using C/N ratio correcting circuit of base... Down converter using C/N ratio correcting circuit of base...

2005-08-16

2005-08-16

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S246100, C455S226300, C455S323000, C375S345000

Reexamination Certificate

active

06931242

ABSTRACT:
A down converter using a C/N ratio correcting circuit of a base station for a mobile communication network includes: a first splitter for splitting an RF signal applied from an antenna; a VGA for controlling the gain of the RF signal split by the first splitter; a down converter for receiving the RF signal gain-compensated by the VGA and converting it to an IF signal; an amplifier for amplifying the RF signal split by the first splitter; a first voltage detect circuit for converting the RF signal applied from the amplifier to a voltage; a second voltage detect circuit for converting the IF signal fedback from the down converter to a voltage; and a comparator for comparing the voltage applied from the second voltage detect circuit and the voltage applied from the first voltage detect circuit and controlling the VGA. A correcting circuit corrects the degradation of the C/N ratio to thereby heighten the C/N ratio of the down converter47and stabilize it, to improve the receiving capability of the base station for a mobile communication network. In addition, replacement of parts due to the degradation and the path loss is prevented, having an effect that its expense is reduced.

REFERENCES:
patent: 5737033 (1998-04-01), Masuda
patent: 6091942 (2000-07-01), Buer et al.
patent: 6370210 (2002-04-01), Yamamoto
patent: 6373907 (2002-04-01), Katsura et al.
patent: 6542029 (2003-04-01), Khesbak et al.
patent: 6597898 (2003-07-01), Iwata et al.

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