Patent ID: 6229797
Filing Date: 2001-05-08
Classification: H04B

Abstract:
A circuit for at least substantially eliminating at least one external interference signal from a radio communications signal received by a code division multiple access (CDMA) mobile phone including a receiving terminal and a low noise amplifier, the circuit comprising:a plurality of damping devices electrically connected in parallel between the receiving terminal and the low noise amplifier wherein each damping device has a fixed gain;a plurality of switches respectively operatively coupled between the plurality of damping devices and the receiving terminal;an interference detector operatively coupled to the receiving terminal for detecting the at least one external interference signal from the received radio communications signal; anda switch driver operatively coupled between the plurality of switches and the interference detector, the switch driver generating a switching signal in response to the interference detector to select at least one of the switches in accordance with the at least one detected interference signal in order to vary a gain associated with the received communications signal in accordance with at least one of the damping devices.