Digital front end for oversampled low-IF or zero-IF multimode receivers

Patent metadata

Field	Value
Publication number	US-8949302-B2
Application number	US-201113173365-A
Country	US
Kind code	B2
Filing date	Jun 30, 2011
Priority date	Jun 30, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A digital radio signal is processed by converting an analog signal to a digital signal, decimating the digital signal using a CIC filter and supplying the decimated digital signal directly to an asynchronous sample rate converter (ASRC). The decimated signal is resampled in the ASRC and the ASRC output is supplied directly to a droop compensation filter to compensate the output of the ASRC. By carefully choosing the response of the CIC filter and the resample rate of the ASRC, aliased artifacts in the pass band can be kept below a threshold magnitude without the need for a channelization filter.

First claim

What is claimed is:

1. A method comprising:
decimating a digital signal generated by an analog to digital converter;
supplying the decimated digital signal to an asynchronous sample rate converter (ASRC);
resampling the decimated digital signal in the ASRC to generate a resampled signal; and
droop compensating the resampled signal.

2. The method as recited in claim 1 wherein the droop compensating utilizes a non-linear phase filter.…

Assignees

• Elenes Javier
• Silicon Lab Inc

Inventors

• Elenes Javier

Classifications

• H03M3/462

  Electricity · mapped topic

• H04B1/001

  Electricity · mapped topic

• H03M3/344

  Electricity · mapped topic

• H04B1/0021 Primary

  Electricity · mapped topic