Noise suppression-enhancement sigma delta modulator structure

A technology of noise suppression and modulator, applied in the direction of analog conversion, electrical components, code conversion, etc., to achieve the effect of improving performance, saving area and power consumption, and simple circuit structure

Inactive Publication Date: 2013-09-25
东南大学无锡分校
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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a noise suppression enhanced ΣΔ modulator structure. Through the noi

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  • Noise suppression-enhancement sigma delta modulator structure

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Such as figure 1 Shown is a noise suppression enhanced ΣΔ modulator structure consisting of an integrator with a transfer function H(z) in the z domain, a quantizer Q, a noise feedback loop with a transfer function G(z) in the z domain; the analog input signal The signal A(z) obtained by subtracting X(z) from the output signal Y(z) of the quantizer Q is used as the input signal of the integrator, and the output signal B(z) of the integrator and the output signal C(z) of the noise feedback loop ) as the input signal of the quantizer Q; the input signal of the noise feedback loop is the signal obtained by subtracting the input signal D(z) of the quantizer Q and the feedback signal Y(z) of the quantizer Q F(z). The analog input signal X(z) is the input signal of the modulator, and the output signal Y(z) of Q is the output signal of the modulator.

[0018] The in...

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Abstract

The invention discloses a noise suppression-enhancement sigma delta modulator structure. Quantizing noise is obtained by making a difference between an input signal and an output signal of a quantizer Q; the quantizing noise is delayed by one period and then fed to integrators, and therefore, one-order noise shaping can be increased in addition to realizing the normal noise suppression, i.e., under the condition that the quantity of the integrators is not changed, a single-ring structure modulator is used for improving the suppression order number of the quantizing noise by one order. The noise suppression-enhancement sigma delta modulator structure disclosed by the invention provides a noise suppression-enhancement technology based on the conventional modulator, and the quantizing noise suppression order number which can be realized by the noise suppression-enhancement technology is higher than the number of the integrators in the modulator; and on the condition of realizing the same performances, the integral power consumption is lowered, the chip area is reduced and the economic benefits are greatly improved.

Description

technical field [0001] The invention relates to a structure of a noise suppression enhanced ΣΔ modulator, which belongs to the integrated circuit technology. Background technique [0002] With the rapid development of science and technology, digital signal processing technology is becoming more and more mature, and we can now use a powerful, flexible and reliable digital signal processor (DSP) to complete the processing of various types of information. But the signals in the real world are all analog quantities. Before processing the analog signals in digital form, we first need to convert the analog signals into digital signals. Therefore, the analog-to-digital converter (ADC) has become an important part of the digital-analog hybrid system, and its performance plays a decisive role in electronic systems such as communication, industrial control, and measurement. Commonly used ADCs mainly include successive approximation (SAR), pipeline (Pipeline) and ΣΔ type. Among them, ...

Claims

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Application Information

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IPC IPC(8): H03M3/00
Inventor 吴建辉胡建飞徐川王海东李红田茜
Owner 东南大学无锡分校
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