RECEIVER WITH SIGMA-DELTA ANALOG-TO-DIGITAL CONVERTER

摘要

A RECEIVER(2200) COMPRISING A SIGMA-DELTA ANALOG-TO-DIGITAL CONVERTER (EA ADC) CAN BE UTILIZED IN ONE OF FOUR CONFIGURATION, AS A SUBSAMPLING BANDPASS RECEIVER, A SUBSAMPLING BASEBAND RECEIVER, A NYQUIST SAMPLING BANDPASS RECEIVER, OR A NYQUIST SAMPLING BASEBAND RECEIVER. FOR SUBSAMPLING EA RECEIVERS, THE SAMPLING FREQUENCY IS LESS THAN TWICE THE CENTER FREQUENCY OF THE INPUT SIGNAL INTO THE EA ADC. FOR NYQUIST SAMPLING EA RECEIVERS, THE SAMPLING FREQUENCY IS AT LEAST TWICE THE HIGHEST FREQUENCY OF THE INPUT SIGNAL INTO THE EA ADC. FOR BASEBAND AE RECEIVERS, THE CENTER FREQUENCY OF THE OUTPUT SIGNAL FROM THE EA ADC IS GREATER THAN ZERO. THE SAMPLING FREQUENCY CAN BE SELECTED BASED ON THE BANDWIDTH OF THE INPUT SIGNAL TO SIMPLIFY THE DESIGN OF THE DIGITAL CIRCUITS USED TO PROCESS THE OUTPUT SAMPLES FROM THE EA ADC. FURTHERMORE, THE CENTER FREQUINCY OF THE INPUT SIGNAL CAN BE SELECTED BASED ON THE SAMPLING FREQUINCY AND THE BANDWIDTH OF THE INPUT SIGNAL. THE EA ADC WITHIN THE RECEIVER PROVIDES MANY BENEFITS.FIG 2