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A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones

Liu Yan, Hua Siliang, Wang Donghui and Hou Chaohuan

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Abstract: We design a digital pre-amplifier which can be directly connected to an electret microphone. The amplifier can convert analog signals into digital signals, has a wide voltage swing and low power consumption, as is required in portable applications. Measurement results show that the dynamic range of the digital pre-amplifier reaches 88 dB, the equivalent input referred noise is 5 Vrms, the typical power consumption is 540 W, and in standby mode the current does not exceed 10 A. Compared with an analog microphone, an electret microphone with digital pre-amplifier offers a better SNR, higher integration, lower power consumption, and higher immunity to system noise.

Key words: digital microphonesCT integratorLDOelectret microphone

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    Received: 18 August 2015 Revised: 01 December 2008 Online: Published: 01 May 2009

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      Liu Yan, Hua Siliang, Wang Donghui, Hou Chaohuan. A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones[J]. Journal of Semiconductors, 2009, 30(5): 055004. doi: 10.1088/1674-4926/30/5/055004 Liu Y, Hua S L, Wang D H, Hou C H. A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones[J]. J. Semicond., 2009, 30(5): 055004. doi:  10.1088/1674-4926/30/5/055004.Export: BibTex EndNote
      Citation:
      Liu Yan, Hua Siliang, Wang Donghui, Hou Chaohuan. A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones[J]. Journal of Semiconductors, 2009, 30(5): 055004. doi: 10.1088/1674-4926/30/5/055004

      Liu Y, Hua S L, Wang D H, Hou C H. A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones[J]. J. Semicond., 2009, 30(5): 055004. doi:  10.1088/1674-4926/30/5/055004.
      Export: BibTex EndNote

      A 540-W digital pre-amplifier with 88-dB dynamic range for electret microphones

      doi: 10.1088/1674-4926/30/5/055004
      • Received Date: 2015-08-18
      • Accepted Date: 2008-09-26
      • Revised Date: 2008-12-01
      • Published Date: 2009-04-20

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