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A Differential Difference Amplifier with Preamplified Choppers for Electret/Condenser Microphones
|關鍵字:||electret condenser microphone;駐極體式麥克風;condenser microphone;differential defference amplifier;DDA;chopper-stabilized amplifier;CHS;preamplifier;電容式麥克風;差動差別放大器;截波穩定型放大器;預先放大器||出版社:||電機工程學系所||引用:|| 王朝慶, “應用於微機電麥克風之可調整增益預先放大器設計,” 中興大學碩士論文, Jun 2005.  陳利如, “實現低雜訊及低失真的CMOS全差動截波穩定型放大器,” 中興大學碩士論文, Jul 2005.  B. Razavi, “Design of Analog CMOS Integrated Circuits,” New York, NY: McGraw-Hill, 2001.  Phillip E. Allen, R. Holberg, “CMOS Analog Circuit Design,” 2nd ed. New York, NY: Oxford, 2002.  David A. Johns, Ken Martin, “Analog Integrated circuit Design,” Canada: Wiley, 1996.  R. Gregorian, “Introduction to CMOS OP-Amps and Cmparators ” Wiley, 1999.  M. Pedersen, W. Olthuis, P. Bergveld, “A polymer condenser microphone on silicon with on-chip CMOS amplifier,” Int. conf. Solid-State Sensors and Actuators, vol. 1, pp. 445-446, 1997.  P. Murphy, K. Hubschi, N. De Rooij, C. Racine, “Subminiature silicon integrated electret capacitor microphone,” IEEE Trans. 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本論文提出了一個運用於駐極體式/純電容式麥克風之含預放大截波器之差動差別放大器；最常見的麥克風預先放大器設計為源極隨耦器(Source Follower)電路，可對麥克風做阻抗轉換並有效地讀出訊號，但單端放大器對共模雜訊和電源雜訊的抵制能力不足，而線性度的表現也比較差；之後有人提出差動差別放大器(Differential Difference Amplifier)的架構，具有很高的共模拒斥比，但是仍無法克服低頻雜訊的問題。所以本文加入截波穩定放大器原理，利用振幅調變(Amplitude Modulation)技巧，將預先放大器本身所產生的低頻雜訊以及輸入偏移電壓所造成的誤差降低；最後，結合源極隨耦器、差動差別放大器和截波穩定放大器的特點，提出一個新的麥克風預先放大器；其輸入阻抗超過100 GΩ，電壓增益為21dB，共模拒斥比為115dB，電源拒斥比為64.8dB；聲音的頻率為20Hz ~ 20kHz，而本預先放大器在上述特性模擬的頻寬皆能大於20kHz。在電路實作上，使用TSMC 0.35μm CMOS 2P4M製程模擬並下線，晶片面積是0.5mm²，電源電壓為1.5V~3V，功率消耗為463μW。
This thesis proposes a differential difference amplifier with preamplified choppers for electret / condenser microphones. The most popular microphone preamplifier is source follower circuit. It can convert the impedance of microphone and extract the audio signals effectively. However, the single-ended amplifier's noise rejection capability for common mode noise and power supply noise is not good enough, the linearity is also not quite well. Some papers propose the structure of differential difference amplifier to achieve high common mode rejection ratio (CMRR). However, the low frequency noise is still a problem to be overcome. Therefore, this thesis adds the theorem of the chopper stabilized amplifier by using the amplitude modulation skills to minimize the errors due to input offset and low frequency noise. Eventually, we combine the characteristics of source follower, differential difference amplifier, and chopper stabilized amplifier to generate a new powerful microphone preamplifier. The input impedance is larger than 100GΩ, with 21dB voltage gain, 115dB CMRR, and 64.8dB PSRR. Because the audio frequency range is 20Hz ~ 20kHz, the bandwidth is wider than 20kHz to meet the requirement. The new preamplifier has been simulated and fabricated using TSMC 0.35um CMOS 2P4M technology in area of 0.5mm² for 1.5V ~ 3V supply voltages and the power consumption is 463uW.
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