| 摘要 |
<p>A dual band transceiver for operating in a first lower frequency band such as the band allocated to cellular systems, and in a second higher frequency band such as the band allocated to personal communication services (PCS) systems (as shown in Figs. 2-4). In a representative embodiment, the dual band transceiver (108 and 118) comprises a main voltage controlled oscillator (VCO) (134) for generating a local oscillator (LO) signal; an offset VCO (136) for generating an offset frequency (OF) signal; a first mixer (132) for combining the LO signal with the OF signal to produce a first transmit signal; a modulator (130) for modulating the first transmit signal with a data signal to produce a first data modulated transmit signal; and a second mixer (154) for combining the first data modulated transmit signal with the LO signal to produce a second data modulated signal. The main VCO (134) and the offset VCO (136) can be programmed such that the first data modulated transmit signal is in the first band and the second data modulated transmit signal is in the second band.</p> |
