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Delta sigma D/A converter

A converter, delta technology, applied in the field of delta sigma digital-to-analog converter, can solve the problems such as error cannot be corrected, and achieve the effects of reduced frequency range, high signal-to-noise ratio, and simple and achievable capabilities

Active Publication Date: 2013-07-24
EHNDRESS KHAUZER GMBKH KO KG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the frequency of the delta-sigma modulator's output signal, as well as its number of edges (per unit time), can vary over a wide range, errors arising from distortion cannot be simply corrected by a constant offset

Method used

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Examples

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Embodiment Construction

[0043] figure 2 Operation of a conventional delta-sigma D / A converter 20 is shown. The delta-sigma D / A converter 20 includes a delta-sigma modulator 22 formed as a digital circuit. The delta-sigma modulator 22 in turn includes a register 24 with a register bit position count that corresponds to the number of bit positions of the digitally valued input signal. In the case of the embodiment of the form shown, a 16-bit delta-sigma modulator 22 is involved. The digital-valued input signal 16 is made to have bits. Moreover, the delta-sigma modulator 22 includes a summation unit 26 to which the summation unit 26 is fed in accordance with the clock signal CLK figure 2 An input signal of digital value represented schematically by box 28 in . Furthermore, the summing unit 26 is fed with the number of digits contained in the register 24 via a feedback loop 29 according to the clock signal CLK. The number obtained from the summation in the summing unit 26 is then written back into...

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Abstract

The invention relates to a delta sigma D / A converter (48) by means of which a digitally valued input signal can be converted to a binary output signal that is time-discrete corresponding to one cycle. In the process, an analog representation of the value of the input signal can be produced using a mean value of the output signal, which has been formed over several cycles. The delta sigma D / A converter (48) is designed such that, during use, said converter provides the output signal by stringing together signal patterns of a set of signal patterns, wherein the signal patterns of the set are each binary, time-discrete corresponding to the cycle, and extend over a signal pattern cycle length of several cycles.; At least two signal patterns of the set have signal pattern mean values which are different from each other, and which are formed over the respective signal pattern cycle length, and all the signal patterns of the set each have substantially the same number, in particular precisely the same number, of flanks.

Description

technical field [0001] The invention relates to a delta sigma digital-to-analog converter (delta sigma D / A converter), by which a digital-valued input signal can be converted into a two-state clock signal time-discrete output signal. In such cases, the value of the input signal can be displayed in analog form by averaging the output signal over a number of clock cycles. Background technique [0002] The delta-sigma D / A converter has at least one delta-sigma modulator of first order or higher. Delta-sigma modulators are basically known from the prior art. A delta-sigma modulator processes an input signal (digital value or analogue) and converts it into a time-discrete output signal of a two-state clock signal, wherein the output signal is always involved in the processing of the input signal. Typically, the clock rate used to operate the delta-sigma modulator and output the output signal is significantly greater than the data rate of the input signal, and is also greater t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/32
CPCH03M3/02H03M7/3028H03M7/3015H03M3/358H03M3/506
Inventor 罗伯特·卢格力迈克尔·科恩阿尔弗雷德·佐兹斯特凡·达米特
Owner EHNDRESS KHAUZER GMBKH KO KG
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