Sigma-delta-sigma modulator for high performance analog-to-digital and digital-to-analog conversion

A sigma-delta-sigma modulator for analog-to-digital signal conversion, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to an A/D quantizer, the digital output of which is passed through a phase 1 clocked latch, through a D/A converter, and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to a phase 1 clocked sample and hold device, the output of which is connected to an output summer where the D/A output is subtracted from it, the output summer connected through a phase 2 clocked sample and hold device delay and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the input summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for analog-to-digital signal conversion, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to an A/D quantizer, the digital data output of which is passed through a phase 1 clocked latch, through a D/A converter, and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to a phase 1 clocked sample and hold device, the output of which is connected to an output summer where the D/A output is subtracted from it, the output summer connected through a phase 2 clocked sample and hold device delay and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the output summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for digital-to-analog signal conversion, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to a rounding element (resolution reducer), the output of which is connected to a D/A converter, the analog output of which is passed through an A/D converter and then through a digital resolution expander and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to an output summer where the expanded A/D output is subtracted from the stage output, the output summer connected through a delay element and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the input summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for digital-to-digital signal resolution compression, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to a rounding element (resolution reducer), the output of which passed through a digital resolution expander and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to an output summer where the expanded A/D output is subtracted from the stage output, the output summer connected through a delay element and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the input summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for digital-to-analog signal conversion, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to a rounding element (resolution reducer), the output of which is connected to a D/A converter, the analog output of which is phase 1 clocked through a sample and hold device, then routed through an A/D converter and then through a digital resolution expander and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to a phase 1 clocked latch;
• the output of which is connected to an output summer where the A/D expanded output is subtracted from it, the output summer connected through a phase 2 clocked latch and then through zero or more gain adjust elements and summed at the input summer;
• the modulator input connected to the input summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for digital-to-digital signal resolution compression, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to a rounding element (resolution reducer), the output of which is phase 1 clocked through a latch, then routed through a digital resolution expander and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to a phase 1 clocked latch;
• the output of which is connected to an output summer where the expanded output is subtracted from it, the output summer connected through a phase 2 clocked latch and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the input summer of the first filter stage in cascade.

A sigma-delta-sigma modulator for digital-to-digital signal resolution compression, comprising:

• one or more filter stages in cascade, connected from the modulator input and connected to a rounding element (resolution reducer), the output of which is phase 1 clocked through a latch, then routed through a digital resolution expander and returned to each filter stage;
• each filter stage comprising an input summer connected to the output and to a phase 1 clocked latch, the output of which is connected to an output summer where the expanded output is subtracted from it, the output summer connected through a phase 2 clocked latch and then through zero or more gain adjust elements and summed at the input summer;
• and
• the modulator input connected to the output summer of the first filter stage in cascade.