IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Regular Section
A Single-Supply 84dB DR Audio-Band ADC for Compact Digital Microphones
Huy-Binh LESang-Gug LEESeung-Tak RYU
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2012 年 E95.C 巻 1 号 p. 130-136

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A 20kHz audio-band ADC with a single pair of power and ground pads is implemented for a digital electret microphone. Under the limited power/ground pad condition, the switching noise effect on the signal quality is estimated via post simulations with parasitic models. Performance degradation is minimized by time-domain noise isolation with sufficient time-spacing between the sampling edge and the output transition. The prototype ADC was implemented in a 0.18µm CMOS process. It operates under a minimum supply voltage of 1.6V with total current of 420µA. Operating at 2.56MHz clock frequency, it achieves 84dB dynamic range and a 64dB peak signal-to-(noise+distortion) ratio. The measured power supply rejection at a 100mVpp 217Hz square wave is -72dB.
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© 2012 The Institute of Electronics, Information and Communication Engineers
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