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High SNR and Wide Dynamic Range Digital MEMS Microphone ROIC
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- Authors
- Yi-Gyeong Kim, Min-Hyung Cho, Chun-Gi Lyuh, Woo Seok Yang
- Issue Date
- 2020-02
- Citation
- 한국 반도체 학술 대회 (KCS) 2020, pp.863-863
- Language
- English
- Type
- Conference Paper
- Abstract
- To collect clear sound signals through beamforming even in high-energy disturbance environment, e.g., wind noise environment, the digital MEMS microphone has to achieve both high-SNR (signal-to-noise ratio) performance and high acoustic overload point (AOP) performance [1]. However, high-SNR and high-AOP performances are in the trade-off relationship in the architecture of a conventional digital MEMS microphone read-out integrated circuit (ROIC) which is composed of a buffer, an amplifier and an ADC (analog-to-digital converter). For high-SNR performance, the ROIC has to use a high gain amplifier which can’t process the large signal. For high-AOP performance, the analog sensor signal has to be amplified with the low-gain which causes low SNR performance.
- KSP Keywords
- Analog to digital converter(ADC), Disturbance environment, Integrated circuit, Low SNR, MEMS Microphone, Sensor signal, Signal noise ratio(SNR), Signal-to-Noise, Trade-off, Wind noise, high SNR