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Sigma delta modulator

A modulator, sigma technology, applied in the field of sigma-delta modulator, can solve problems such as instability, and achieve the effect of reducing circuit technology costs

Inactive Publication Date: 2004-07-21
NOKIA SIEMENS NETWORKS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first approach a high-order feedback loop is applied, which can be reduced to a maximum of two signal states (1-bit signal technique), however, noise shaping from the third order may lead to inappropriate Stablize

Method used

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Embodiment Construction

[0030] The starting point of the invention is the known first-order sigma-delta modulator shown schematically in FIG. 1 . Without losing the generality of the present invention, the input signal x(k) is normalized to the value range -1≤x(k)≤1 in the following investigation, and the step height of the quantizer is assumed to be 2 / (L-1 ), where L represents the number of quantization levels. The digital sigma-delta modulator converts the digital input signal x(k) into a 3-level (1.5 bit) data stream as output signal y(k). It will be apparent that various types of quantizers or their equivalents can be used in order to effectuate the conversion into a quantized digital data stream.

[0031] The digital input signal x(k) is fed into an adder 1 whose output is sent to a delay 2 . The output of delayer 2 is fed to adder 3 and at the same time to the input of decider 4, in which the signal delayed by one pulse unit in delayer 2 with respect to signal x(k) are quantized into a spe...

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Abstract

The invention relates to a sigma delta modulator for converting time-discrete sampled values or samples into corresponding analog signals in, in particular, digital radio communications devices. The invention is characterized in that a sigma delta modulator of the first order is parallelized, and a cascaded sigma delta modulator of a higher order is constructed of several parallelized structures of the first order.

Description

technical field [0001] The present invention relates to a sigma-delta modulator for converting a digital input signal into a quantized output signal by means of a first-order sigma-delta modulator, said first-order sigma-delta The modulator has first and second adders, a delay, and a decider, wherein the modulated input signal input to the first-order sigma-delta modulator passes through the first adder and thereafter After being delayed by one pulse unit, the delayer is connected to the second adder on the one hand, and is connected to the determiner on the other hand, and the modulated output signal generated by the determiner is reversed Connected to the second adder, the quantization error value is obtained by the second adder and input to the first adder. The invention additionally relates to higher-order sigma-delta modulators formed from such sigma-delta modulators. Background technique [0002] In a digital-to-analog converter, as it is used, for example, in digita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/00H03M7/32H03M7/36
CPCH03M7/3022
Inventor B·耶伦尼克
Owner NOKIA SIEMENS NETWORKS GMBH & CO KG
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