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Method and device for reducing digital switching noise in mixed signal IC

A technology of integrated circuits and circuits, applied in digital-to-analog converters, electrical components, analog-to-digital conversion, etc., and can solve problems such as artificial traces

Inactive Publication Date: 2004-11-10
ATMEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the bi-stable switching of the PCI output coincides with the analog sampling, then the switching will have artifacts due to the PCI switching
Since the sample clock and PCI clock are fully asynchronous, this condition is likely to occur during the operation of the device

Method used

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  • Method and device for reducing digital switching noise in mixed signal IC
  • Method and device for reducing digital switching noise in mixed signal IC
  • Method and device for reducing digital switching noise in mixed signal IC

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Embodiment Construction

[0014] The best solution for implementing the present invention

[0015] figure 1 is a mixed signal integrated circuit (100) according to a preferred embodiment of the present invention. In mixed-signal integrated circuits, digital circuits and analog circuits use the same substrate, which is generally N-type material, and active devices made of this substrate are used to make logic circuits.

[0016] The analog circuit includes a codec consisting of a digital-to-analog conversion circuit (DAC) 122 and an analog-to-digital conversion circuit (ADC) 124 . exist figure 1 In an implemented embodiment, the sigma-delta technique is preferably used. However, any sampling A / D or D / A converter technique may be used in the present invention.

[0017] A trigger signal FOSR 158 derived from control circuit 150 is fed into each of DAC 122 and ADC 124 . FOSR is used as a sampling enable signal, enabling each conversion circuit to sample an analog signal to be converted into digital dat...

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PUM

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Abstract

A mixed signal IC 100 comprising analog circuitry for converting between analog and digital signals and digital circuitry includes circuitry to produce a conversion enable signal (158) which causes the analog circuit to perform a conversion between an analog signal and a digital signal. The circuitry also asserts a warning signal (156) prior to production of the enable signal to momentarily disable the digital circuitry during operation of the analog circuitry. By so doing, noise artifacts from operation of the digital circuitry is eliminated when the analog circuitry is making a conversion.

Description

[0001] technical field of invention [0002] The present invention relates generally to integrated circuits containing digital logic circuits and sampled analog circuits, and more particularly to methods and apparatus for reducing digital switching noise in these circuits. Background technique [0003] As integrated circuit technology advances, it becomes practical to include more and more functions in a single integrated circuit device. The current trend is to combine high-precision analog circuits on the same chip to form high-performance digital circuits. However, due to the nature of integrated circuit design, high-precision analog circuits are negatively affected by the noise generated when switching digital logic circuits. For example, digital and analog circuits are typically powered by separate power supplies. Noise associated with power-coupled ground planes can affect the proper operation of analog circuits. [0004] Most high precision analog converters are known...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/06H03M1/08H03M1/12H03M1/66
CPCH03M1/12H03M1/0624H03M1/0863H03M1/66H03M1/00
Inventor C·P·A·坦恩
Owner ATMEL CORP