| 摘要 |
A multi-band RF transceiver (100) includes a single dual band VCO (102) that is used in both transmit and receive modes of operation. The VCO's low band frequency output signal that is provided on output line (120) is multiplied by two by multiplier circuit (1302), when in the high band receive mode, as for example, when receiving a PCS or DCS signal. The VCO's high band frequency output signal provided on output line (120) is divided by two by divider circuit (130) when in the low band receive mode, as for example, when receiving a GSM signal. The single multi-band VCO (102) design provides for low susceptibility to both LO leakage and DC offset caused by radiation. <IMAGE> |
