3.3V mixed-mode IC design using switched-current techniques for speech applications

研究成果: Article

摘要

A low-cost, low-voltage, mixed-mode integrated circuit for speech applications is presented. The mixed-mode 1C can directly preamplify speech signals with the aid of automatic gain control, convert amplified signals to 1-bit digital codes at 24kbit/s, store the converted codes in memory, and replay the stored codes through an on-chip current-input voltageoutput power amplifier. Switched-current techniques are used to implement a filter with a 3.4kHz bandwidth and a 96kHz sampling frequency, and also an adaptive delta modulator (ADM) with a 24kHz sampling frequency. Measured dynamic range of the SI ADM combined with the SI filter is greater than 40dB. This mixed-mode 1C, operating with a 3.3V supply voltage, was fabricated by a 1.5-μm singlepoly single-metal CMOS process. The whole system has been tested using human voice and results show that it is highly suitable for low-cost speech applications. Adaptive delta modulation. Low-cost speech recorder. Mixed-mode 1C, Switched-current design

原文English
頁(從 - 到)367-374
頁數8
期刊IEE Proceedings: Circuits, Devices and Systems
144
發行號6
DOIs
出版狀態Published - 1997 一月 1

    指紋

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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