Patent ID: 7120406
Filing Date: 2006-10-10
Classification: H03D

Abstract:
1. A multiband receiver for simultaneous reception of a plurality of multiband RF signals, at least some of which being at different carrier frequencies, comprising: an RF receiving part for processing the RF signals; an RF/IF converter for converting the plurality of RD signals to a plurality of analog intermediate frequency signals, the RF/IF converter including a plurality of local oscillators corresponding to the plurality of RF signals for producing LO signals, which are associated with the carrier frequencies and have LO in-phase components and LO quadrature components, the RF/IF converter also including an in-phase mixer and a quadrature mixer for mixing the respective LO in-phase and quadrature components with the RF signals so as to produce the intermediate frequency signals with IF in-phase components and IF quadrature components in an intermediate frequency band, the RF/IF converter further including a complex filter for effecting complex filtering based on the intermediate frequency signals so as to suppress mirror-image intermediate frequency signals; an IF receiving part for processing the intermediate frequency signals; an A/D converter for converting the analog intermediate frequency signals to digital intermediate frequency signals; and a digital signal processing part for digital signal processing of the digital intermediate frequency signals and for producing recovered data signals, wherein the digital signal processing part includes a plurality of local oscillators for producing digital signal components associated with the intermediate frequency signals, and a plurality of digital low-pass filters for filtering the digital signal components.