Predictive analog-to-digital converter and methods thereof

A method for producing a full bitwidth output using a predictive analog-to-digital converter, comprising:

• sampling an analog input signal to generate a sampled analog input signal;
• calculating an analog prediction error signal by combining an analog prediction signal with the sampled analog input signal;
• if the analog prediction error signal is within a range of a lower bitwidth analog-to-digital converter, digitizing the analog prediction error signal with the lower bitwidth analog-to-digital converter producing a lower bitwidth error signal and adding the lower bitwidth error signal to a prediction signal and outputting the full bitwidth output;
• if the analog prediction error signal is not within the range of the lower bitwidth analog-to-digital converter, performing one of digitizing the analog prediction error signal with a full bitwidth analog-to-digital converter producing a full bitwidth error signal and adding the full bitwidth error signal to the prediction signal and outputting the full bitwidth output or digitizing the sampled input signal with a full bitwidth analog-to-digital converter and outputting the full bitwidth output;
• and
• processing the full bitwidth output in a feedback section to produce the prediction signal and the analog prediction signal.

A predictive Analog-to-Digital Converter producing a full bitwidth digital output, comprising:

• a sampling section for producing a sampled analog input signal from an analog input signal;
• a first summer for producing an analog prediction error signal as the difference between the sampled analog input signal and an analog prediction signal;
• an error analog-to-digital converter coupled to said first summer, comprising:
• at least one analog-to-digital converter for producing a prediction error signal;
• and
• an over-range detector that determines whether the prediction error signal is outside a range of the analog-to-digital converter;
• wherein a digital error signal from said error analog-to-digital or converter is one of a full bitwidth digital error signal when said prediction error signal is outside the range or a low bitwidth digital error signal when said prediction error signal is within range;
• a second summer coupled to the digital error signal and a digital prediction signal, for producing the full bitwidth digital output;
• and
• a feedback section coupled to the full bitwidth digital output comprising a prediction filter for producing the digital prediction signal and a digital-to-analog converter for producing the analog prediction signal.

A predictive Analog-to-Digital Converter producing a full bitwidth output, comprising:

• a sampling section for producing a sampled analog input signal from an analog input signal;
• a first summer for producing an analog prediction error signal as the difference between the sampled analog input signal and an analog prediction signal;
• at least one analog-to-digital converter coupled to the first summer for producing a prediction error signal;
• and
• an over-range detector that determines whether the prediction error signal is outside a range of the analog-to-digital converter;
• if the prediction error signal is not within the range, digitize the analog input signal to produce the full bitwidth output;
• if the prediction error signal is within range, add a digitized analog prediction error signal with the digital prediction signal to produce the full bitwidth output;
• a feedback section coupled to the full bitwidth output comprising a prediction filter for producing the digital prediction signal and a digital-to-analog converter for producing the analog prediction signal.