Dynamic element matching in A/D converters
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsBengt Erik Jonsson, Christer Alf Jansson
Life of this patent
Estimating the term…
Abstract
An A/D converter stage including an A/D sub-converter connected to a D/A sub-converter provides dynamic element matching. This is accomplished by forcing comparators of the A/D sub-converter to generate a scrambled thermometer code.
Claims25
A dynamic element matching method for a D/A sub-converter of an A/D converter stage, comprising:
- controlling comparators of an A/D sub-converter to generate scrambled thermometer code, and
- de-scrambling said scrambled thermometer code before thermometer-to-binary code conversion.
An apparatus for dynamic element matching in a D/A sub-converter of an A/D converter stage, comprising:
- means for controlling comparators of an A/D sub-converter to generate scrambled thermometer code, and
- a Wallace tree for thermometer-to-binary code conversion of said scrambled thermometer code.
A dynamic element matching method for a D/A sub-converter of an A/D converter stage, comprising:
- controlling comparators of an A/D sub-converter to generate scrambled thermometer code, and
- Wallace tree decoding for thermometer-to-binary code conversion of said scrambled thermometer code.
An apparatus for dynamic element matching in a D/A sub-converter of an A/D converter stage, comprising:
- means for controlling comparators of an A/D sub-converter to generate scrambled thermometer code, and
- means for de-scrambling said scrambled thermometer code before thermometer-to-binary code conversion.
An A/D converter stage including an A/D sub-converter, comprising:
- means for controlling comparators of said A/D sub-converter to generate scrambled thermometer code, and
- a Wallace tree for thermometer-to-binary code conversion of said scrambled thermometer code.
A multi-stage A/D converter, comprising:
- means for dynamic element matching including means for controlling A/D sub-converter comparators to generate scrambled thermometer code, and
- a Wallace tree for thermometer-to-binary code conversion of said scrambled thermometer code.
An A/D converter stage including an A/D sub-converter, comprising:
- means for controlling comparators of said A/D sub-converter to generate scrambled thermometer code, and
- means for de-scrambling said scrambled thermometer code before thermometer-to-binary code conversion.
Apparatus comprising:
- first control circuitry for controlling comparators of an A/D subconverter to generate scrambled thermometer code, and
- a Wallace tree for thermometer-to-binary code conversion of said scrambled thermometer code.
A multi-stage A/D converter, comprising:
- means for dynamic element matching;
- including means for controlling A/D sub-converter comparators to generate scrambled thermometer code, and
- means for de-scrambling said scrambled thermometer code before thermometer-to-binary code conversion.
A apparatus comprising:
- first control circuitry for controlling comparators of an A/D subconverter to generate scrambled thermometer code, and
- second control circuitry for de-scrambling said scrambled thermometer code before thermometer-to-binary code conversion.
Dependencies are inferred from the claim text.