| 摘要 |
A receiver ( 400 ) includes a mixing digital-to-analog converter (DAC) ( 410 ), a direct digital frequency synthesizer (DDFS) ( 402 ), a scrambler ( 404 ), a decoder ( 406 ), and a multiplexer ( 408 ). The DDFS ( 402 ) includes outputs configured to provide bits associated with a digital local oscillator (LO) signal to control inputs of the mixing DAC ( 410 ). The scrambler ( 404 ) includes inputs coupled to the outputs of the DDFS ( 402 ) and is configured to scramble the bits of the digital LO signal. The decoder ( 406 ) includes inputs coupled to the outputs of the DDFS ( 402 ). The decoder ( 406 ) is configured to provide the bits of the digital LO signal without scrambling. The multiplexer ( 408 ) includes first inputs coupled to outputs of the scrambler ( 404 ), second inputs coupled to outputs of the decoder ( 406 ), and outputs coupled to the control inputs of the DDFS ( 402 ). The multiplexer ( 408 ) is configured to couple the first inputs to the control inputs of the mixing DAC ( 410 ) for a first frequency band and to couple the second inputs to the control inputs of the mixing DAC ( 410 ) for a second frequency band.
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