| 摘要 |
An RF transmitter ( 104 ) includes a shared local oscillator circuit ( 126 ), transmit path circuitry ( 120, 122, 124 ), a divider ( 134 ), and a lowpass filter ( 322 ). The shared local oscillator circuit ( 126 ) generates a shared LO signal ( 116 ). The transmit path circuitry ( 120, 122, 124 ) mixes a baseband signal ( 107 ) and an IF mixing signal ( 116 ) to provide an IF signal ( 112 ), and converts the IF signal ( 112 ) to an RF transmit signal ( 105 ) at a desired frequency using an RF mixing signal received at a mixing input thereof. The divider ( 134 ) divides the shared LO signal ( 116 ) to provide an unfiltered RF mixing signal. The lowpass filter ( 322 ) has an input for receiving the unfiltered RF mixing signal, and an output coupled to the mixing input of the transmit path circuitry ( 120, 122, 124 ) for providing the RF mixing signal.
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