| Autor: |
Gil-Cho Ahn, Jong Do Lee, Seung Yong Bae, Eun Ju Choe |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Applied Mechanics and Materials. :1633-1637 |
| ISSN: |
1662-7482 |
| DOI: |
10.4028/www.scientific.net/amm.475-476.1633 |
| Popis: |
This paper presents a low distortion analog front-end (AFE) circuit to process electret microphone output signal. A source follower is employed for the input buffer to interface electret microphone directly to the IC with level shifting. A single-ended to differential converter with output common-mode control is presented to compensate the common-mode variation resulted from gate to source voltage variation in the source follower. A replica stage is adopted to control the output bias voltage of the single-ended to differential converter. The prototype AFE circuit fabricated in a 0.35μm CMOS technology achieves 68.2dB peak SNDR and 79.9dB SFDR over an audio signal bandwidth of 20kHz with 2.5V supply while consuming 1.05mW. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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