Attenuator with switch function and mobile telephone...

Details Attenuator with switch function and mobile telephone... Attenuator with switch function and mobile telephone...

2007-07-17

2007-07-17

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S197200, C455S236100, C327S306000, C327S330000

Reexamination Certificate

active

10767278

ABSTRACT:
A high frequency part, which amplifies a high frequency signal outputted from an intermediate frequency part and supplies to an antenna, is equipped with a gain controller with switch function. The gain controller with switch function comprises an attenuator with switch function has a function of switching a selected band between two bands outputted from the intermediate frequency part and controlling the gain of the high frequency signal in the selected band. The attenuator with switch function comprises a first variable resistor which connects a signal input part with a signal output part and a second variable resistor which is disposed parallel to said first variable resistor and connects a signal input part with a signal output part. The first and the second variable resistors are controlled by a common gain control voltage and set such that the gain control voltage ranges, which are for changing the resistor values, will not overlap with each other.

REFERENCES:
patent: 4380824 (1983-04-01), Inoue
patent: 4466126 (1984-08-01), Fujimoto
patent: 5303268 (1994-04-01), Tsutsumi et al.
patent: 5903178 (1999-05-01), Miyatsuji et al.
patent: 6229370 (2001-05-01), Inamori et al.
patent: 02039681 (1990-02-01), None
patent: 08228138 (1996-09-01), None
patent: 11186921 (1999-07-01), None
patent: 11346131 (1999-12-01), None
Japanese Office Action dated Oct. 17, 2006 with English translation.

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