Attenuator with switch function and mobile telephone...

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

2007-06-05

2008-11-18

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

07454182

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.

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Japanese Office Action dated Oct. 17, 2006 with English translation.
European Search Report dated Jan. 15, 2008.

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