Local oscillation frequency generation apparatus and wireless transceiver having the same

摘要

A multiple local oscillation frequency generation apparatus (230) which can generate local oscillation frequencies in at least two frequency bands and a wireless transceiver having the multiple local oscillation frequency generation apparatus (230) are provided. The local oscillation frequency generation apparatus (230) includes: an oscillation unit (232) which comprises a plurality of VCOs that provide at least two local oscillation signals having different frequencies for modulating/demodulating RF signals in at least two frequency bands; a PLL (231) which locks the frequencies of the local oscillation signals provided by the VCOs; a first switch (233) which selects one of the local oscillation signal provided the VCOs according to a frequency band of a RF signal; a frequency conversion unit (234) which converts the frequency of the selected local oscillation signal ; and a phase shift unit (237) which generates I-phase and Q-phase local oscillation signals by shifting the phase of a signal output by the frequency conversion unit (234).