A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements can each be configured as a plurality of sub-elements. The value of each of the filter elements can be varied by switching between at least two of the plurality of sub-elements. Switching noise within a desired passband can be reduced by switching at a rate that is greater than the desired passband. The switching noise in the passband can be further reduced by pseudo-randomly switching between the sub-elements. The filter can use a delta-sigma modulator to generate a pseudo-random switching signal.
申请公布号
WO2004095700(A2)
申请公布日期
2004.11.04
申请号
WO2004US12309
申请日期
2004.04.20
申请人
QUORUM SYSTEMS, INC;MARTIN, BRIAN, C.;MALONE, LAWRENCE, J.