19-10-2010, 04:55 PM
Software Radio 3.ppt (Size: 701 KB / Downloads: 69)
A/D and D/A Conversion,analog to digital and digital to analog
Data Converter impacts the factor for the performance of the overall radio design
Requirements: very high sampling rates, high number of effective quantization bits, an operating bandwidth of several Ghz, a large spurious-free dynamic range, a reasonable price
DAC and ADC converters
Sampling and Quantization
Nyquist Zones
Aliasing
Bandpass filtering – uses image to translate bandpass signals to baseband
Errors occurs in Quantization
Quantization Noise
Overload distortion