石英陀螺Sigma-Delta帶通調(diào)制器的設(shè)計
發(fā)布時間：2019-03-29 06:25
【摘要】：近年來半導(dǎo)體行業(yè)迅猛發(fā)展使各類電子產(chǎn)品性能得到了質(zhì)的飛躍,使國防科技力量和人民生活質(zhì)量都有了很大的提升。雖然國內(nèi)半導(dǎo)體行業(yè)也在突飛猛進(jìn),但對于一些核心芯片的研究卻始終未能有突破性成果。信號鏈包括數(shù)字信號處理部分與模擬接口電路部分,隨著前者信號處理能力日益提升,后者已然成為約束信號鏈性能上升的瓶頸。當(dāng)前MEMS傳感器在軍民兩用中都扮演著重要的角色,石英陀螺儀為其重要分支。Sigma-Delta ADC作為傳感器系統(tǒng)中重要的模擬接口電路組成部分,影響著整個石英陀螺儀的性能參數(shù)。其中調(diào)制器作為ADC中核心模塊單元,研制出高指標(biāo)的調(diào)制器有著重要意義。調(diào)制器包括低通型與帶通型這兩種功能不同的類別。當(dāng)前在信號調(diào)制領(lǐng)域中,大部分科研工作者對低通調(diào)制器研究的針對性較強(qiáng),而帶通調(diào)制器的研究相比之下就較為匱乏。本設(shè)計結(jié)合實(shí)驗(yàn)室石英陀螺儀傳感器的項(xiàng)目需要,以帶通型代替低通型作為ADC中的模擬前端調(diào)制器,對其進(jìn)行了相應(yīng)研究并讓設(shè)計的創(chuàng)新性有所提升。本課題中帶通型調(diào)制器基于低通轉(zhuǎn)化為帶通的理論基礎(chǔ)來設(shè)計,由基本低通型轉(zhuǎn)化而來。本文設(shè)計思路是首先將帶通型調(diào)制器在Simulink中完成系統(tǒng)級模型建立與仿真,確保模型可行性后再對非理想因素研究分析。然后在0.35μm CMOS制造工藝、電源電壓±2.5V的環(huán)境下搭建系統(tǒng)整體電路、仿真驗(yàn)證、版圖繪制,其主要模塊單元為諧振器、全差分運(yùn)放、一位量化器、不交疊時鐘產(chǎn)生電路等。該帶通調(diào)制器具有通帶中心頻率可控功能,可根據(jù)輸入的數(shù)字邏輯電平來調(diào)節(jié),并且能夠根據(jù)數(shù)字邏輯電平的輸入值來精確地控制通帶中心頻率在采樣頻率的1/6、1/4、1/3處,通帶寬度為200Hz。當(dāng)采樣頻率fs=64k Hz時,令其具有不同通帶中心頻率并進(jìn)行仿真。前仿真結(jié)果表明,該帶通型調(diào)制器在不同通帶中心頻率下信噪比均值約80d B,輸入動態(tài)范圍為70.88d B,最大輸入信號幅度為-3.1d BFs。后仿真結(jié)果顯示信噪比約60d B,輸入動態(tài)范圍為59.08dB,且溫度特性較穩(wěn)定,芯片總面積為5.017mm~2。
[Abstract]:In recent years, the rapid development of semiconductor industry has made a qualitative leap in the performance of all kinds of electronic products, so that the national defense science and technology strength and the quality of life of the people have been greatly improved. Although the domestic semiconductor industry is also advancing by leaps and bounds, the research on some core chips has never made a breakthrough. The signal chain includes the digital signal processing part and the analog interface circuit. With the improvement of the former's signal processing ability, the latter has become the bottleneck of restricting the performance of the signal chain. At present, MEMS sensors play an important role in both military and civil use, and quartz gyroscope is an important branch of it. Sigma-Delta ADC, as an important part of analog interface circuit in sensor system, affects the performance parameters of the whole quartz gyroscope. As the core module unit of ADC, it is of great significance to develop a high index modulator. Modulators include two different types of functions, low-pass and band-pass. At present, in the field of signal modulation, most researchers focus on the research of low-pass modulator, but the research of band-pass modulator is less than that of low-pass modulator. According to the project requirement of the quartz gyroscope sensor in the laboratory, the band-pass model is used as the analog front-end modulator in ADC instead of the low-pass type, and the innovation of the design is improved. In this paper, the band-pass modulator is designed based on the theory of low-pass conversion to band-pass, which is derived from the basic low-pass modulator. The design idea of this paper is to establish and simulate the system-level model of the bandpass modulator in Simulink to ensure the feasibility of the model and then analyze the non-ideal factors. Then the whole circuit of the system is built in 0.35 渭 m CMOS manufacturing process, the power supply voltage is 鹵2.5 V, the simulation verification, layout drawing, its main module unit is resonator, fully differential amplifier, one-bit quantizer, non-overlapping clock generation circuit, and so on. The main modules of the circuit are resonator, full differential amplifier, one-bit quantizer, non-overlapping clock generation circuit and so on. The band-pass modulator has the function of controlling the center frequency of the pass band, which can be adjusted according to the input digital logic level. According to the input value of the digital logic level, the central frequency of the pass band can be precisely controlled at 1? 6, 1? 4, 1? 3 of the sampling frequency, and the band width is 200 Hz. When sampling frequency fs=64k Hz, make it have different pass band center frequency and carry on simulation. The simulation results show that the average SNR of the bandpass modulator is about 80 dB at different central frequencies, the input dynamic range is 70.88 dB, and the maximum input signal amplitude is-3.1 d BFs.. The simulation results show that the SNR is about 60dB, the input dynamic range is 59.08dB, and the temperature characteristic is stable. The total area of the chip is 5.017mm 路m ~ (- 2).
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN761
本文編號：2449243
[Abstract]:In recent years, the rapid development of semiconductor industry has made a qualitative leap in the performance of all kinds of electronic products, so that the national defense science and technology strength and the quality of life of the people have been greatly improved. Although the domestic semiconductor industry is also advancing by leaps and bounds, the research on some core chips has never made a breakthrough. The signal chain includes the digital signal processing part and the analog interface circuit. With the improvement of the former's signal processing ability, the latter has become the bottleneck of restricting the performance of the signal chain. At present, MEMS sensors play an important role in both military and civil use, and quartz gyroscope is an important branch of it. Sigma-Delta ADC, as an important part of analog interface circuit in sensor system, affects the performance parameters of the whole quartz gyroscope. As the core module unit of ADC, it is of great significance to develop a high index modulator. Modulators include two different types of functions, low-pass and band-pass. At present, in the field of signal modulation, most researchers focus on the research of low-pass modulator, but the research of band-pass modulator is less than that of low-pass modulator. According to the project requirement of the quartz gyroscope sensor in the laboratory, the band-pass model is used as the analog front-end modulator in ADC instead of the low-pass type, and the innovation of the design is improved. In this paper, the band-pass modulator is designed based on the theory of low-pass conversion to band-pass, which is derived from the basic low-pass modulator. The design idea of this paper is to establish and simulate the system-level model of the bandpass modulator in Simulink to ensure the feasibility of the model and then analyze the non-ideal factors. Then the whole circuit of the system is built in 0.35 渭 m CMOS manufacturing process, the power supply voltage is 鹵2.5 V, the simulation verification, layout drawing, its main module unit is resonator, fully differential amplifier, one-bit quantizer, non-overlapping clock generation circuit, and so on. The main modules of the circuit are resonator, full differential amplifier, one-bit quantizer, non-overlapping clock generation circuit and so on. The band-pass modulator has the function of controlling the center frequency of the pass band, which can be adjusted according to the input digital logic level. According to the input value of the digital logic level, the central frequency of the pass band can be precisely controlled at 1? 6, 1? 4, 1? 3 of the sampling frequency, and the band width is 200 Hz. When sampling frequency fs=64k Hz, make it have different pass band center frequency and carry on simulation. The simulation results show that the average SNR of the bandpass modulator is about 80 dB at different central frequencies, the input dynamic range is 70.88 dB, and the maximum input signal amplitude is-3.1 d BFs.. The simulation results show that the SNR is about 60dB, the input dynamic range is 59.08dB, and the temperature characteristic is stable. The total area of the chip is 5.017mm 路m ~ (- 2).
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN761
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相關(guān)博士學(xué)位論文 前2條
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相關(guān)碩士學(xué)位論文 前2條
1 閆冬;數(shù)字陀螺Sigma-Delta調(diào)制器的設(shè)計[D];哈爾濱工業(yè)大學(xué);2016年
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