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Noise reduction circuit and delta-ς modulator

A modulator and circuit technology, applied in the field of noise reduction, can solve problems such as occupation, large chip area, and increased manufacturing cost

Active Publication Date: 2021-01-22
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Delta-sigma (delta-sigma) modulators typically suffer from quantization noise and digital-to-analog converter (DAC) noise that can degrade signal quality and circuit efficiency
However, the bulky resistor-capacitor low-pass filter will occupy a large chip area and increase the manufacturing cost

Method used

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  • Noise reduction circuit and delta-ς modulator
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  • Noise reduction circuit and delta-ς modulator

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Embodiment Construction

[0020] The following description is a preferred embodiment of the present invention, which is only used to illustrate the technical features of the present invention, but not to limit the scope of the present invention. While certain terms are used throughout the specification and claims to refer to specific elements, those skilled in the art should understand that manufacturers may use different names for the same element. Therefore, the specification and claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the basis for the difference. The terms "element", "system" and "apparatus" used in the present invention may be a computer-related entity, where the computer may be hardware, software, or a combination of hardware and software. The terms "comprising" and "including" mentioned in the following description and claims are open terms, so they should be interpreted as "including, but not limited ...

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Abstract

The invention provides a noise reduction circuit, which includes: a transistor, a signal generation circuit and a noise detection circuit. The signal generation circuit is used to provide the input signal, and the noise detection circuit is coupled to the transistor and the signal generation circuit. The noise detection circuit is used to receive the input signal provided by the signal generation circuit, and generate an output signal to the transistor. Wherein, the AC component of the output signal generated by the noise detection circuit reduces the AC component of the input signal provided by the signal generating circuit, and the output signal and the input signal have opposite polarities. Correspondingly, the present invention also provides a delta-sigma modulator. With the present invention, the chip area can be reduced.

Description

technical field [0001] The present invention relates to a noise reduction technique, and more particularly, to a noise reduction circuit and an associated delta-sigma modulator. Background technique [0002] Delta-sigma (delta-sigma) modulators are often affected by quantization noise and digital-to-analog converter (DAC) noise, which can degrade signal quality and circuit efficiency. Quantization noise can be reduced by increasing an over-sampling ratio (OSR), quantization bits, or loop filter order. However, DAC noise from a bias source cannot be easily eliminated when a large swing input is applied. One of the current solutions to reduce DAC noise is to add a bulky resistor-capacitor low-pass filter in the bias path. However, the bulky resistor-capacitor low-pass filter will occupy a large chip area and increase the manufacturing cost. Contents of the invention [0003] In view of this, one of the objects of the present invention is to provide a noise reduction circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/00
CPCG05F3/262H03M3/368H03F1/26H03F3/193H03F2200/498H03M3/422H03M3/322H03M3/50H03M3/30H03M1/12H03M1/00
Inventor 蔡鸿杰
Owner MEDIATEK INC