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Multiplexer-related

Multi-stage-digital-to-analog-conversion-circuit-and-method

Digital sample rate converters having matched group delay

According to a first aspect of the invention, a method is provided for operating two or more sample ...

Decimator apparatus for decreasing the word rate of a digital signal of the type employed in digital telephone systems

OF THE INVENTION Referring to FIG. 1, there is shown a simplified diagram of a telephone ...

Interpolator/decimator filter structure and a notch filter therefor

The present invention is intended as a solution to the problem of providing in excess of 3 dB ...

Dual tone multi-frequency detector

What is claimed is: 1. An apparatus for identifying a first tone and a second tone present in a ...

Filtering a signal with the use of approximate arithmetical division

One object of the present invention is to provide a method which will enable an arithmetical ...

Motion estimation

It is an object of some aspects of the present invention to provide methods for fast block ...

Apparatus and method for sampling rate conversion with rational factors

OF A PREFERRED EMBODIMENT For convenience, a glossary of terms used here and their definitions is ...

Fixed or adaptive deinterleaved transform coding for image coding and intra coding of video

The present invention solves this problem by using a deinterleaving step prior to the ...

Data recovery device

Briefly, according to the invention, there is provided a data recovery device for recovering data ...

Transceiver providing selectable frequencies and spreading sequences

A transceiver for transmitting and receiving digital data in a network environment is described. T...

Multi-stage digital to analog conversion circuit and method

Details

Inventors: Cabler, Carlin D.; Linz, Alfredo R.;
Assignee: Advanced Micro Devices, Inc. (Austin, TX)
Primary Examiner: Williams; Howard L.
Assistant Examiner:
Attorney, Agent or Firm: Fulbright & Jaworski, L.L.P.

This invention is for a digital-to-analog conversion circuit (DAC) which includes an interpolation filter circuit, a noise shaper circuit and a semi-digital FIR filter circuit. The entire DAC circuit provides noise shaping, analog filtering and oversampling functions.

DETAILED DESCRIPTION The present invention is for a digital-to-analog conversion circuit (DAC) which includes an interpolation filter circuit, a noise shaper circuit, and a semi-digital FIR filter circuit.
The interpolator oversamples a digital input signal to 64 times the sample rate of the multi-bit digital input signal.
A noise shaper circuit then converts the multi-bit signal output from the interpolation filter to a one-bit signal.
The one-bit signal is then input to a semi-digital FIR filter which converts the one-bit signal to an analog signal and low pass filters the analog signal.

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