A converter

A converter, digital-to-analog converter technology, applied in the field of converters, to achieve the effect of improving noise performance

Inactive Publication Date: 2011-06-29
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Multi-bit DACs and ADCs have the advantage over single-bit designs including better choice of noise-shaping function...

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Embodiment Construction

[0078] One or more embodiments disclosed herein may provide algorithms that may be implemented in the analog or digital domain, enabling the convenient implementation of higher order noise functions in the DAC of the feedback loop of a sigma-delta converter. Such an algorithm may be viewed as a convenient implementation that performs the required processing fast enough that it can be used to process large bandwidth signals satisfactorily.

[0079] Dynamic Element Matching (DEM) is a technique that can be applied to oversampled multi-bit digital-to-analog converters (DACs), known to be used as part of a sigma-delta analog-to-digital converter. An example of a prior art sigma-delta analog-to-digital converter (DAC) is figure 1 shown.

[0080] figure 1 The sigma-delta ADC 100 receives an analog signal x 102 which is provided as an input to an adder 104 . The output of adder 104 is provided to loop filter 106 , and the output of loop filter 106 is provided to M-bit quantizer 10...

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Abstract

A method of providing a value for each element of a sequence of elements in a converter, comprising: calculating a pointer position for the present conversion cycle (Pi+1) in accordance with an Nth order noise shaped function based on pointer positions for N previous conversion cycles (Pi to Pi-(N-1)); determining if the pointer position for the present conversion cycle (Pi+1) is in excess of the number of elements in the sequence; attributing a first component-value to all of the elements, updating the new pointer position (Pi+1) by performing a modulo operation and replacing the new pointer position (Pi+1) with the remainder value; attributing a second component-value to the elements in accordance with a (N-1)th order algorithm; attributing a third component-value to the elements in accordance with the inverse of the second component-value for the previous conversion cycle; and adding the first, second and third component-values for each element.

Description

technical field [0001] The present invention relates to the field of converters and in particular, but not exclusively, to a method of assigning values ​​to a series of DAC elements of a multi-bit data converter during successive conversion cycles. Background technique [0002] Delta Sigma analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), collectively referred to as delta-sigma data converters, are widely used in high-precision, low-bandwidth applications. [0003] Multi-bit DACs and ADCs have the advantage over single-bit designs including better choice of noise-shaping functions, although multi-bit converters have the disadvantage of requiring matching between components in order to achieve linearity and low noise. [0004] US 6,384,761 (Melanson) discloses a multi-bit data converter. [0005] US 6,266,002 (Gong et al.) discloses a second order noise shaping dynamic element matched to a multi-bit data converter. [0006] The listing and discuss...

Claims

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Application Information

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IPC IPC(8): H03M1/00
CPCH03M1/74H03M3/464H03M1/0668H03M3/424
Inventor 胡晶晶吕西安·约翰内斯·布伦默斯
Owner NXP BV
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