High input-impedance voice ADC for digital microphone

• Project name
  • - High input-impedance voice ADC for digital microphone
• Project objective
  • - Implement a one-chip ADC for digital clectret condenser microphones (ECM)
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• Project Contents & Scope
  • Low power one-chip ADC for digital ECMs:
    • > High Input Impedance Audio Preamplifier
    • > Switched-Capacitor Sigma-Delta Modulator
  • Specifications:
    • > Wide supply range : 1.6 V ~ 3.3 V
    • > High dynamic range : > 80 dB
    • > Low power : < 500 uA
    • > Small chip size : < 1 mm2
• Project Result
  • - 2nd Version single-chip ADC for Digital Electret Microphone: DR=84dB, Power=420uA, VDD=1.6-2.0V Chip size=750x770 um2
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• Publications
  • Huy-Binh Le, Seung-Tak Ryu, Sang-Gug Lee, “An 84B DR Audio-Band ADC with a Single Power Supply Port for Compact Digital Microphones,” submitted to CICC 2009.
  • Huy-Binh Le, Seung-Tak Ryu, Sang-Gug Lee, “A Fully On-chip Gm-Opamp-RC Based Preamplifier for Electret Condenser Microphones", IEICE Trans, Electron, VOL E92-C. No.4, Apr. 2009.
  • Le, H.B.; Nam, J.W.; Ryu, S.T.; Lee, S.G.;, “Single-chip A/D converter for digital microphones with on-chip preamplifier and time-domain noise isolation" IEE Electronics Letters, vol. 45, Issue.3, pp.151-153, Jan.29 2009.
  • Huy-Binh Le, Jae-Won Nam, Seung-Tak Ryu and Sang-Gug Lee, “A CMOS Sigma-Delta Modulator for a Digital Electret Microphone with a High Input-Impedance Preamplifier,” The 15th Korean Conference on Semiconductors (KCS) 2008, 20-22 Feb. 2008 Pages: 741-742
  • Jae-Won Nam, Le Huy Binh, Seung-Tak Ryu, and Sang-Gug Lee “Digital microphone with high input impedance linear pre-amplifier,” Korea, Patent pending, Dec. 4. 2007
• Project Term
  • - 1st year: Mar 2007 - Mar 2008
  • - 2nd year: Mar 2008 - Mar 2009
• Project Sponsor
  • - RFSemi