应用笔记 1835

REP039: The MAX2510 IF Transceiver with the MAX5183 DAC


摘要 : RF systems, which require direct coupling between the baseband output digital-to-analog converter (DAC) and the input to the I/Q modulator, present a design challenge. This unique requirement of direct coupling does not exist in many RF systems because the modulation and encoding are contrived to avoid the need for DC response at this point in the system. When the need for very low frequency response exists, a way must be found to route the DAC output signal into the I/Q modulator while providing acceptable RF performance. This application note describes tests carried out on the MAX2510 IF transceiver to measure the impact of DC coupling into the modulator, presents the test results, and proposes a simple circuit to provide the DC interface to the MAX5183 DAC.