Sigma-Delta analog-to-digital converter

An analog-to-digital converter and filter technology, applied in the field of integrated circuits, can solve the problems of large influence of process deviation, integrator operating frequency, settling time integration accuracy and power consumption deterioration, affecting the filtering accuracy of the analog-to-digital converter, etc. achieve the effect of avoiding adverse effects

Inactive Publication Date: 2010-02-03
ZHEJIANG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a Sigma-Delta analog-to-digital converter using a new class-C inverter to overcome the fact that the transconductance of the push-pull class-C inverter in the prior art is greatly affected by the process deviation (especially when the size of the M

Method used

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Example Embodiment

[0037] Embodiment 1. The block diagram of the Sigma-Delta analog-to-digital converter of the present invention is as attached Figure 5 As shown, it includes the prior art anti-aliasing filter 50, the sample-and-hold 51, the digital decimation filter 53, and the innovative analog modulator 52 of the present invention. The sample holder 51 is used for oversampling the analog input signal to reduce the quantization noise in the signal bandwidth, and the analog modulator 52 is used for noise shaping in the analog-to-digital conversion process. Oversampling and noise shaping are two key technologies of Sigma-Delta ADC. The analog modulator 52 uses a new type C inverter with application number 2009103013271 (patent name: Class C inverter using a body potential modulator) (the same below) instead of the traditional operational amplifier or the prior art class C inverter The new type C inverter is based on the prior art C type inverter 40, adding micro-power PMOS bulk modulator 41 and...

Example Embodiment

[0051] Embodiment 2: The third-order single-ring structure Sigma-Delta analog-to-digital converter proposed by the present invention is characterized in that the analog modulator therein is a third-order single-ring structure. Attached Figure 7 It is a structural block diagram of a third-order single-loop analog modulator, which includes three pseudo-differential structure switched capacitor integrators 70, 71 and 72 and two adders 54, 73 and coarse quantizer 56 of the prior art. Among them, three integrators 70, 71, and 72 are connected in series in a single loop to form a loop filter 55. The coarse quantizer 56 includes a feedforward ADC56a and a feedback DAC56b. It can be used in combination with the loop filter 55 to achieve a third-order Noise shaping and precise analog-to-digital conversion. c1, c2, and c3 are the scaling factors of the modulator, which are used to scale the signal so that within the input range of the modulator, the output swing of the integrator does n...

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Abstract

The invention discloses a Sigma-Delta analog-to-digital converter adopting a novel C type reverser. The Sigma-Delta analog-to-digital converter comprises a Sigma-Delta modulator (52) based on the novel C type reverser, as well as an anti-aliasing filter (50), a sampling holder (51) and a digital extraction filter (53) based on the prior art. In the Sigma-Delta modulator (52), a loop filter (55) is realized by a pseudo-difference structure switched-capacitor integrator based on the novel C type reverser through the single-loop serial mode or the multi-path cascade mode of the prior art; by thebulk potential modulating action of a bulk potential modulator in the novel C type reverser at the input tube body end of the reverser, the adverse effect of the process deviation on the loop filtering accuracy of the analog-to-digital converter is overcome; and under the condition that the power consumption is not obviously increased, the stability and the robustness of the circuit are greatly improved.

Description

technical field [0001] The invention relates to an analog-to-digital converter and belongs to the technical field of integrated circuits. Background technique [0002] At present, with the rapid development of my country's consumer electronics industry and multimedia industry, digital audio technology is developing very rapidly. As an indispensable link, the analog-to-digital converter needs to continue to move towards lower voltage, lower power consumption, lower cost and higher performance. Among them, the low-voltage and low-power consumption design must become the future development of the analog-to-digital converter. One of the main directions. However, the reduction of power supply voltage means the reduction of input common mode range, the reduction of dynamic range, the deterioration of noise and distortion performance, etc., we need to adopt more advanced low power design ideas and more sophisticated circuit design to overcome these difficulties. [0003] The tra...

Claims

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Application Information

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IPC IPC(8): H03M3/02
Inventor 蔡坤明韩雁罗豪黄小伟张昊韩晓霞
Owner ZHEJIANG UNIV
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