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Oversampled high order modulator

A high-order modulation and modulator technology, applied in the field of oversampling high-order modulators, can solve problems such as modulator operation interference

Inactive Publication Date: 2003-11-05
ATEMAI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This reset of the integrator is an effective method of recovering the modulator from an unstable state, but there is still a significant disturbance in the operation of the modulator

Method used

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Embodiment Construction

[0017] The ΣΔ modulator can be realized by using a multiple feedback (MF) structure as shown in FIGS. 1 to 4 or a feedforward (FF) structure as shown in FIG. 5 . Both MF and FF ΣΔ modulators include a series n-stage integrating circuit H 1 , H 2 , H 3 ,…H n , where n is a positive integer. The order of the modulator is equal to the number of stages of the integrating circuit. A modulator comprising at least three integrating circuit stages (a third-order modulator) is called a higher-order modulator. In the MF modulator structure of Figures 1, 3 and 4, when the signal is sent to the first integration circuit stage H 1 Previously, in a summing device 11, a feedback signal output from the modulator adjusted by the feedback coefficient b1 was converted from the input signal A of the modulator in Subtract from. Similarly, each subsequent integrator stage H 2 、H 3 、H 4 Each includes a subtractor device 12, 13, 14, which subtracts the feedback signal adjusted by the feedba...

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Abstract

The invention relates to an oversampling high-order modulator, especially a ΣΔ modulator, which includes a number of integrators (H1, H2,...HN) corresponding to the modulator order, a quantizer (15), and a Negative feedback (21, 22, 23, 24). The problem with higher-order modulators is that the modulator is locked in an unstable state, which should be restored without disturbing the modulator operation. The present invention achieves this by temporarily changing the value of negative feedback in the direction of restoring a stable state.

Description

technical field [0001] The present invention relates to an oversampled high order modulator, especially a ΣΔ modulator. Background technique [0002] In analog-to-digital converters (A / D) and digital-to-analog converters (D / A) using noise-shaping techniques based on oversampling and ΣΔ (sum-of-difference modulation), the signal is passed in a ΣΔ modulator to a The oversampling frequency is quantized to one or a few bits. The resulting quantization noise is shaped in such a way that the proportion of the quantization noise remaining in the actual signal bandwidth frequency band is kept as small as possible and the noise is moved out of the signal band. Noise The performance of shaping mainly depends on the order and oversampling ratio of the noise shaper, that is, the ΣΔ modulator. A high-order modulator can attenuate the quantization noise in the signal band more than a low-order modulator. Therefore, a high-order modulator A filter can provide a better signal-to-noise rati...

Claims

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Application Information

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IPC IPC(8): H03M3/02H03M3/04
CPCH03M3/362H03M3/43H03M3/454
Inventor 朱哈·海基拉劳里·里帕斯蒂
Owner ATEMAI
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