System for analog to digital conversion with improved spurious free dynamic range

An analog to digital conversion (ADC) system comprising:

• a segmented ADC circuit comprising a plurality of interleaved ADC segments, said segmented ADC circuit configured to generate a digital signal comprising a channel, said channel associated with a channel frequency;
• a frequency down-converter circuit coupled to said segmented ADC circuit, said frequency down-converter circuit configured to frequency shift said digital signal by a frequency offset;
• a spur frequency prediction circuit coupled to said frequency down-converter circuit, said spur frequency prediction circuit configured to predict frequencies of spurs generated by said ADC segments, said prediction based on the number of said ADC segments and based on the sampling rate of said digital signal;
• said spur frequency prediction circuit further configured to generate said frequency offset based on said predicted spur frequencies and based on a frequency band of said channel;
• and
• a filter circuit coupled to said frequency down-converter circuit, said filter circuit configured to remove one or more of said spurs from said frequency shifted digital signal to generate a filtered signal.

A method for analog to digital conversion, said method comprising:

• configuring a plurality of interleaved ADC segments to generate a digital signal comprising a channel, said channel associated with a channel frequency band;
• predicting frequencies of spurs generated by said ADC segments, said prediction based on the number of said ADC segments and based on the sampling rate of said digital signal;
• generating a frequency offset based on said predicted spur frequencies and based on said channel frequency band;
• frequency shifting said digital signal by said frequency offset;
• and
• filtering one or more of said spurs from said frequency shifted digital signal.

A computer-readable storage medium having instructions stored thereon which when executed by a processor result in the following operations for estimating receiver noise variance, said operations comprising:

• configuring a plurality of interleaved ADC segments to generate a digital signal comprising a channel, said channel associated with a channel frequency band;
• predicting frequencies of spurs generated by said ADC segments, said prediction based on the number of said ADC segments and based on the sampling rate of said digital signal;
• generating a frequency offset based on said predicted spur frequencies and based on said channel frequency band;
• frequency shifting said digital signal by said frequency offset;
• and
• filtering one or more of said spurs from said frequency shifted digital signal.

A mobile communication platform comprising:

• a processor;
• a memory coupled to said processor;
• an input/output (I/O) system coupled to said processor;
• a display coupled to said I/O system;
• and
• an ADC system coupled to said processor, said ADC system comprising:
• a segmented ADC circuit comprising a plurality of interleaved ADC segments, said segmented ADC circuit configured to generate a digital signal comprising a channel, said channel associated with a channel frequency;
• a frequency down-converter circuit coupled to said segmented ADC circuit, said frequency down-converter circuit configured to frequency shift said digital signal by a frequency offset;
• a spur frequency prediction circuit coupled to said frequency down-converter circuit, said spur frequency prediction circuit configured to predict frequencies of spurs generated by said ADC segments, said prediction based on the number of said ADC segments and based on the sampling rate of said digital signal;
• said spur frequency prediction circuit further configured to generate said frequency offset based on said predicted spur frequencies and based on a frequency band of said channel;
• and
• a filter circuit coupled to said frequency down-converter circuit, said filter circuit configured to remove one or more of said spurs from said frequency shifted digital signal to generate a filtered signal.