hods??????????????????????一37 4.1.2Types ofdown converter??????????????????????40 4.2 Muitirate digitalsignalprocessing theory???????????????·4l 4.2.1Integer timesdecimate???????????????????????42 4.2.2Integer timesinterpolating?????????????????????43 4.3 Hardware design of adigitalquadrature receiver with directsampling ??????????????????????????????????????.44 4.3.1Design indicatorsand overalldesign???????????????“44 4.3.2Design ofvariable gain amplifier?????????????????.46 4.3.3Design ofanalog tOdigital converter???????????????一48 4.3.4Design ofdigital down converter?????????????????”51 4.4 Conclusions????????????????????????????????54 Chapter 5 Summary and prospect????.???????·??????55 5.1 Summary?????????????????????????????????·55 5.2 Prospect??????????????????????????????????56 一IX—
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