適用于Sigma-Delta ADC的多抽取率數(shù)字濾波器設(shè)計
2022年電子技術(shù)應(yīng)用第1期
王 堯,卜 剛
南京航空航天大學(xué) 電子信息工程學(xué)院,江蘇 南京210000
摘要: 采用標(biāo)準(zhǔn)0.18 μm工藝,設(shè)計了一種能改變抽取率并且適應(yīng)不同信號帶寬的應(yīng)用于Sigma-Delta模數(shù)轉(zhuǎn)換器的數(shù)字抽取濾波器。該濾波器采用多級抽取,由級聯(lián)積分梳狀濾波器、補(bǔ)償濾波器和半帶濾波器組成。實現(xiàn)的數(shù)字濾波器抽取率可以在64、128、256、512中變化,并且補(bǔ)償濾波器和半帶濾波器的帶寬可調(diào)整。濾波器版圖尺寸0.6 mm×0.6 mm。在1.98 V工作電壓下,最大總功耗約為2 mW,最高信噪比達(dá)到110.5 dB。當(dāng)補(bǔ)償濾波器和半帶濾波器的通帶截止頻率根據(jù)帶寬選擇從最高降到最低時,可分別節(jié)省56%和39%的功耗;當(dāng)濾波器功耗降至最小69.63 μW時,所能處理的帶寬為390.6 Hz,信噪比為107.8 dB。
中圖分類號: TN492
文獻(xiàn)標(biāo)識碼: A
DOI:10.16157/j.issn.0258-7998.211706
中文引用格式: 王堯,卜剛. 適用于Sigma-Delta ADC的多抽取率數(shù)字濾波器設(shè)計[J].電子技術(shù)應(yīng)用,2022,48(1):89-93.
英文引用格式: Wang Yao,Bu Gang. Design of multi-decimation rate digital filter for sigma-delta ADC[J]. Application of Electronic Technique,2022,48(1):89-93.
文獻(xiàn)標(biāo)識碼: A
DOI:10.16157/j.issn.0258-7998.211706
中文引用格式: 王堯,卜剛. 適用于Sigma-Delta ADC的多抽取率數(shù)字濾波器設(shè)計[J].電子技術(shù)應(yīng)用,2022,48(1):89-93.
英文引用格式: Wang Yao,Bu Gang. Design of multi-decimation rate digital filter for sigma-delta ADC[J]. Application of Electronic Technique,2022,48(1):89-93.
Design of multi-decimation rate digital filter for sigma-delta ADC
Wang Yao,Bu Gang
College of Electronic Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China
Abstract: Based on the standard 0.18 μm process, a digital decimation filter applied to the Sigma-Delta analog-to-digital converter is designed, which can change the decimation rate and adapt to different signal bandwidths. The filter adopts multi-stage decimation and consists of a cascaded integrator comb filter, a compensation filter and a half-band filter. The realized digital filter can be changed in the decimation rate of 64,128,256 and 512. Compensation filters and half-band filters of different bandwidths are also designed. The filter area is 0.6 mm×0.6 mm. Under 1.98 V working voltage, the total maximum power consumption is about 2 mW, and the highest signal-to-noise ratio reaches 110.5 dB. When the passband frequency of the compensation filter and the half-band filter is selected according to the bandwidth from the highest to the lowest, it can save 61% and 53% of the power consumption respectively; When the filter power consumption being the smallest 69.63 μW, the bandwidth that can be processed is 390.6 Hz, and the signal-to-noise ratio is 107.8 dB.
Key words : digital decimation filter;multiple decimation rate; low power consumption; multiple bandwidth
0 引言
現(xiàn)代信息技術(shù)飛速發(fā)展,導(dǎo)致對模數(shù)轉(zhuǎn)換器(Analog-To-Digital Converter,ADC)的需求越來越大,對其要求也越來越高。而Sigma-delta ADC作為實現(xiàn)高分辨率ADC的方案被業(yè)界所認(rèn)可。這種濾波器通過過采樣和噪聲整形技術(shù)提高信噪比,在調(diào)制器之后需要濾波器來降低采樣率并濾除帶外噪聲。采用多級結(jié)構(gòu)是業(yè)內(nèi)的常用做法,因為單級結(jié)構(gòu)的濾波器往往需要上千階,實現(xiàn)困難。本文采用多抽取率和多帶寬的濾波器結(jié)構(gòu),意在讓其適用于多種輸入信號帶寬下多種轉(zhuǎn)換精度的要求。
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作者信息:
王 堯,卜 剛
(南京航空航天大學(xué) 電子信息工程學(xué)院,江蘇 南京210000)
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