System and method for successive approximation
AssigneeTexas Instruments Incorporated
InventorDavid Walker Guidry
Life of this patent
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Abstract
A system and method for providing successive approximation, such as can be used by a successive approximation converter or by a coherent undersampling digitizer. The system comprising a memory having a successive approximation value and a comparison system configured to receive and amplify the difference between a test signal and the successive approximation value and to convert the amplified signal to a digital signal. A multi-bit analog to digital convert can be used to convert the amplified signal to a digital signal.
Claims22
A successive approximation undersampling ADC system comprising:
- a memory having a successive approximation value;
- a summer coupled to a test signal and an output of the memory to generate a difference signal being a difference therebetween;
- an amplifier coupled to an output of the summer to generate an amplified signal from the difference signal;
- a single multi-bit analog to digital converter coupled to an output of the amplifier to convert the amplified signal to a digital signal wherein the analog to digital converter operates as a comparator until the amplified signal is within range of the analog to digital converter.
A coherent undersampling digitizer, comprising:
- means for receiving a repetitive test signal from a device under test in accordance with first clock signals;
- means for producing a difference signal based on the difference between the repetitive test signal and a successive approximation signal;
- means for amplifying the difference signal;
- and
- means for converting the amplified difference signal to a multi-bit digital comparison signal wherein the converting means operates as a comparator until the amplified difference signal is within range of the converting means.
A method for successive approximation undersampling analog to digital conversion, comprising:
- combining a test signal with a successive approximation signal;
- amplifying the combined signal to generate an amplified combined signal;
- converting the amplified combined signal to a multi-bit digital comparison signal using a multibit analog to digital converter that operates as a comparator until the amplified combined signal is within range of the analog to digital converter;
- and
- adjusting the successive approximation signal based on the digital comparison signal.
Dependencies are inferred from the claim text.