Apparatus and method for processing analog signals using residue-based digital operations
AssigneeTexas Instruments Incorporated
InventorsShivaling Mahant-Shetti, Venu Gopinathan
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Abstract
In apparatus for digital processing to a sequence of numbers in binary format, each number is first converted to a base number and a residue number, the residue number being in a binary bit format. The processing is then performed using only the residue numbers. The digital processing is perfumed using binary addition, binary subtraction, and binary multiplication operations. After completion of the processing operation, the residue numbers are then converted into the original format. The folding analog-to-digital converter can be used to generate the residue binary bit numbers from an analog signal. This technique can reduce the apparatus required to perform such processing operations as FIR filtering and equalization.
Claims12
A system for performing a processing operation on analog signals, said system comprising:
- an analog-to-digital converter unit for providing a sequence of groups of residue numbers, each residue number derived from a base number;
- and
- digital processing apparatus having said sequence of groups of residue numbers applied thereto, said digital processing apparatus performing said processing operation on said sequence of residue numbers.
A method of processing an input analog signal to signal capable of being manipulated by a digital processing unit, said method comprising the step of:
- converting said input analog signal to digital residue number signals.
An analog-to-digital converter for converting an input analog signal to residue number digital signals, said converter comprising:
- a comparator unit for determining a magnitude of said input signal relative to base number and a voltage level within said base number;
- and
- an encoder unit for converting said magnitude into said residue number digital signals.
Dependencies are inferred from the claim text.