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Modulator of 2-1 type MASH structure

A technology of modulator and device nine, which is applied in the field of analog-digital circuits, can solve the problems of low signal-to-noise ratio, and achieve the effects of enhancing noise suppression effect, improving zero-pole position, and good noise suppression effect

Inactive Publication Date: 2019-04-23
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the problem of low signal-to-noise ratio of the modulator of the existing 2-1 type MASH structure, and to propose a modulator of the 2-1 type MASH structure

Method used

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  • Modulator of 2-1 type MASH structure
  • Modulator of 2-1 type MASH structure
  • Modulator of 2-1 type MASH structure

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and the following embodiments.

[0019] Such as image 3As shown, the modulator of the 2-1 type MASH structure includes adder 1 301, adder 2 302, adder 3 303, adder 4 304, adder 5 305, scaler 1 201, scaler 2 202, scale Scale three 203, Scale four 204, Scale five 205, Scale six 206, Scale seven 207, Scale eight 208, Integrator one 401, Integrator two 402, Integrator three 403, Quantizer one 501, Quantization Two 502, delay unit 601, differentiator one 701 and differentiator two 702, the input signal is input to an input end of adder one 301, the output end of adder one 301 is connected to the input end of scaler one 201, scaler one The output end of 201 connects the input end of integrator one 401, the output end of integrator one 401 connects the input end of propor...

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Abstract

The invention relates to the field of analog-to-digital circuits. For the problem that the signal-to-noise ratio of the modulator of the existing 2-1 type MASH structure is low, a modulator of 2-1 type MASH structure is proposed, which sets appropriate gain parameters in the modulator of the existing 2-1 type MASH structure to adjust the noise transfer function (NTF) of the modulator to improve the position of the zero pole, so that the quantization noise of the first stage is canceled out through the digital error correction logic due to the output of a first-stage modulator and the output ofa second-stage modulator, and the noise suppression effect within the signal bandwidth is enhanced. The structure is applicable to modulators in analog-to-digital conversion of audios.

Description

technical field [0001] The invention relates to the field of analog-digital circuits, in particular to a modulator with a MASH structure. Background technique [0002] Due to the robustness of digital circuits, their small size and their ease of integration into complex systems, digital processing has come to dominate computing and signal processing. However, analog signals are still everywhere in the real world, so an analog-to-digital converter (Analog-DigitalConverter, ADC) is needed between the digital signal processor and the real world. ADC is mainly divided into two categories according to the sampling frequency: Nyquist type (Nyquist) and oversampling type (Oversampling). Audio ADCs do not require high conversion rates, but high resolution requirements, so most of them use oversampling. The oversampling ADC mainly includes two parts: a modulator (Modulator) and a digital filter (Digital Filter, DF). Work. The debugger is the core processing unit, so it is necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/414
Inventor 蒲显城李想
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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