Patent ID: 6292474
Filing Date: 2001-09-18
Classification: H04B

Abstract:
A multi-mode radio receiver operable to receive first receive signals generate during operation of a first radio communication system and to receive at least second receive signals generated during operation of at least a second radio communication system, said multi-mode radio receiver comprising:a first receive chain portion having a front end side and a back end side, the front end side of said first receive chain portion coupled to receive indications of the first receive signal, said first receive chain portion having at least a first amplifier, the first amplifier selectably biased to cause said first receive chain portion to act upon the indications of the first receive signal;a second receive chain portion having a front end side and a back end side, the front end side of said second receive chain portion coupled to receive indications of the second receive signal, said second receive chain portion having at least a second amplifier, the second amplifier selectably biased to cause said second receive chain portion to act upon the indications of the second receive signal, either one, but not both, of said first receive chain portion and said second receive chain portion selected to be operable during a selected period;shared circuitry coupled to both said first receive chain portion and to said second receive chain portion, said shared circuitry alternately operable with said first receive chain portion to from a portion thereof and with said second receive chain portion to form a portion thereof, said shared circuitry including amplifier biasing and switching circuitry for biasing a selected one of the first amplifier and the at least the second amplifier; anda common receive chain portion coupled both to the back end side of said first receive chain portion and to the back end side of said second receive chain portion, said common receive chain portion for acting further upon a selected one of the indications of the first receive signal and the indications of the second receive signal, the selected one corresponding to which of said first receive chain portion and said second receive chain portion is selected to be operable during the selected period.