Patent ID: 8542142
Filing Date: 2013-09-24
Classification: H03M

Abstract:
1. An interleaved analog to digital converter with digital equalization, comprising: A. a composite ADC including M time interleaved sub-ADCs and having a composite ADC input for receiving an input analog signal, and adapted for generating a corresponding stream of digital sample signals at a composite ADC output; B. a demultiplexer having an demux input coupled to the composite ADC output, and adapted to split the stream of digital sample signals into N sub streams with each sub stream characterized by a samples rate reduced by a factor N, and each sub stream being applied to a respective one of N demux outputs; C. a samples repositioning unit having N-group inputs coupled to respective ones of said N demux outputs, N-group leading outputs and N-group lagging outputs, and adapted for D. a first PreFIRs transformer having N first PreFIRs inputs and K first PreFIRs outputs, and a second PreFIRs transformer having N second PreFIRs inputs and K second PreFIRs outputs, E. K double buffer FIR filters, each double buffer FIR filter having K leading FIR inputs, K lagging FIR inputs and K FIR filter outputs, wherein the K leading FIR inputs of the double buffer FIR filter are connected to corresponding outputs of the first PreFIRs transformer and the K lagging FIR inputs of the double buffer FIR filter are connected to corresponding outputs of the second PreFIRs transformer, and wherein the K double buffer FIR filters effect K coefficient-weighted combinations of the processed leading N-group digital sample signals applied from the first PreFIRs transformer and the processed lagging N-group digital sample signals applied from the second PreFIRs transformer, and apply those K coefficient-weighted combinations to respective ones of the K FIR filter outputs; F. a PostFIRs transformer with K PostFIRs inputs and N PostFIRs outputs, wherein each of the K PostFIRs inputs is connected to the output of a corresponding double buffer FIR filter, and wherein each PostFIRs transformer is adapted iteratively process the applied K coefficient-weighted combinations and apply the so-processed coefficient-weighted combinations to respective ones of the N PostFIRs outputs, G. a samples sequence restoration unit having N repositioned N-group inputs connected to respective ones of the N PostFIRs outputs, and N-group outputs, wherein the samples sequence restoration unit is adapted for generating a restored sample stream comprising restored N sub stream samples, wherein the order of samples is restored to an initial order, and applying the restored sample stream to the respective N-group outputs; and H. a multiplexer having N mux inputs connected to the N-group outputs of the samples sequence restoration unit, and an equalizer output, and wherein the multiplexer is adapted for combining the restored N sub stream samples from the samples sequence restoration unit into one output samples stream applied to the equalizer output.