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Bandpass sigma-delta analogue/digital converter for converting an if signal

A technology of analog-to-digital converters and converters, applied in the directions of analog-to-digital conversion, analog conversion, code conversion, etc., can solve the problems of suppression and weakening, and achieve the effect of improving the quality factor of the loop

Active Publication Date: 2009-10-07
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If make BPSDM work at f RES =ZF, the necessary suppression is so much weakened that it can only be achieved by a tuned input loop

Method used

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  • Bandpass sigma-delta analogue/digital converter for converting an if signal
  • Bandpass sigma-delta analogue/digital converter for converting an if signal
  • Bandpass sigma-delta analogue/digital converter for converting an if signal

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Embodiment Construction

[0027] figure 1 The general structure of the bandpass sigma-delta analog-to-digital modulator 1 (BPSDM) is shown. The structure of the band-pass sigma-delta analog-to-digital modulator 1 is composed of two cascaded second-order band-pass filters 2, 3 with feedback. The feedback includes a multi-bit quantizer 4 through a D / A converter 5 (DAC) feedback to the first filter and feedback from the multi-bit quantizer 4 via the D / A converter 6 to the second filter. Therefore, BPSDM1 is a fourth-order modulator. The quantizer 4 is controlled by the second filter 3. The quantizer 4 and the D / A converters 5, 6 are advantageously implemented as multi-bit converters in order to further reduce the quantization noise of the modulator as much as possible. The linearity between the D / A converter 6 and the first filter 2 is improved by a dynamic element matching control module (DEM) 7 with band-pass noise shaping. Due to the second-order noise shaping algorithm, the quantization noise generated ...

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Abstract

The invention relates to a bandpass sigma-delta analogue / digital converter (1) with a first and second bandpass filter (2, 3) connected in cascades and a quantizer (4) with feedback by means of D / A converters to the first and to the second filter, wherein the feedback to the first filter is routed via the control module by means of second-order noise formation to the first D / A converter, and the feedback to the second filter does not take place via the control module, however.

Description

Technical field [0001] The present invention generally relates to a mid-band pass sigma-delta analog-to-digital converter (A / D converter). Background technique [0002] Digital car radio products currently manufactured in mass production use a bandpass sigma-delta modulator (BPSDM) to convert the intermediate frequency (ZF). BPSDM is f S = The sampling frequency of 14.25MHz samples the intermediate frequency ZF. Here, the resonance frequency is adjusted to f Res = F S / 4=3.5625MHz. The sampling operation causes the intermediate frequency ZF to be aliased to the resonance frequency at the odd harmonic fR of the resonance frequency. The third harmonic with a frequency of 10.6875MHz corresponds to the ZF of the receiver. [0003] US 5442353 describes a bandpass sigma-delta analog-to-digital converter composed of a first fourth-order bandpass sigma-delta modulator and a second second-order bandpass sigma-delta modulator, wherein the second converter is The signal of the first convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/04
CPCH03M3/464H03M3/30H03M3/408H03M3/338H03M3/454H03M1/0668H03M3/406H03M3/424
Inventor H·梅德C·莱尔D·尼恩胡伊斯
Owner ROBERT BOSCH GMBH