| 摘要 |
PURPOSE: A dual-band wideband local signal generating device is provided to differently form a signal generated in an oscillator and a local signal supplied to a transceiving terminal, thereby reducing VCO pulling. CONSTITUTION: Oscillation units(101,102,103) generate a positive in-phase signal, a negative in-phase signal, a negative orthogonal phase signal, and a positive orthogonal phase signal. Frequency de-multipliers(104,105) generate an RF signal by de-multiplying frequencies of generated IP and IN signals. A poly phase filter(107) generates LO signal of IP, IN, QP, and QN. Switch units(108,109) select a high-band frequency signal or a low band frequency signal. A single side band mixer(106) generates a local signal by the sum or the subtraction of the de-multiplied signal and the selected signal.
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