A/d multi-channel architecture

Abstract

An apparatus and method for A/D conversion is provided. The apparatus provides for multi-channel A/D conversion. It may be used in any application in which A/D conversion of either a single signal or multiple signal sources is required. Such applications include X-DSL communications. The apparatus and method allows A/D converters to be fabricated with reduced cost and power when compared with prior art designs. The A/D converter comprises a sampler, a converter and a logic. The sampler includes an input coupled with at least one analog information signal. The sampler repetitively provides at least one pre-sample together with a sample of the analog information signal. The sampling interval between the samples is substantially greater than a pre-sample interval between the pre-sample and the corresponding sample. The converter includes a bit line output and at least one input coupled with the output of said sampler. The converter is responsive to the pre-sample at the input to output a first bit signal corresponding to at least one significant bit of the pre-sample at the bit line output. The converter is further responsive to the sample at the input, to output a second bit signal corresponding to at least one significant bit of the sample at the bit line output. The logic is coupled with the bit line output of said converter. The logic combines the first bit signal and the second bit signal into a composite digital sample of the pre-sample together with the sample.