Patent ID: 7792228

Claim:
A multi-mode digital down-converter for down-converting an incoming intermediate frequency (IF) signal to baseband level according to a selected one of a plurality of air interface standards, said multi-mode digital down-converter comprising: a reconfigurable gain control block controlled by a first gain parameter stored in a control register, the reconfigurable gain control block capable of amplifying said incoming IF signal; a mixer stage capable of receiving and down-converting said amplified incoming IF signal to produce a first in-phase (I) baseband signal, wherein said mixer stage receives a first reference signal from a programmable oscillator; and a reconfigurable cascaded integrator/comb (CIC) decimation filter block controlled by a second gain parameter and a first decimation parameter, wherein the first decimation parameter controls a decimation rate of the CIC decimation filter block based on the selected air interface standard, wherein said reconfigurable CIC decimation filter block is capable of filtering said first in-phase baseband signal according to said second gain parameter and decimating said first in-phase baseband signal according to said first decimation parameter to produce a first filtered in-phase baseband signal, wherein said first and second gain parameters and said first decimation parameter are determined by said selected air interface standard, wherein said programmable oscillator is programmed according to said selected air interface standard, and wherein the decimation parameter of a particular CIC filter is alterable.