MIXING DAC AND POLYPHASE FILTER ARCHITECTURES FOR A RADIO FREQUENCY RECEIVER

A receiver ( 200 ) includes a mixing digital-to-analog converter (DAC) ( 208 ), a direct digital frequency synthesizer (DDFS), a transimpedance amplifier (TIA) ( 204 ) and a first polyphase filter (PPF) ( 202 ). The mixing DAC ( 208 ) includes a radio frequency (RF) transconductance section for providing an RF current signal responsive to an RF signal and a switching section. The switching section is coupled to the RF transconductance section and includes inputs for receiving bits associated with a digital local oscillator (LO) signal. The switching section is configured to mix the RF current signal with the digital LO signal to provide an analog output signal at outputs of the switching section. The transimpedance amplifier (TIA) ( 204 ) includes inputs each coupled to a respective one of the outputs of the switching section and outputs. The first PPF ( 202 ) includes inputs each coupled to a respective one the outputs of the TIA ( 204 ).