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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A Micropower Logarithmic A/D With Offset and Temperature Compensation
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A Micropower Logarithmic A/D With Offset and Temperature Compensation

机译：具有失调和温度补偿的微功耗对数模数转换器

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摘要

Logarithmic circuits are useful in many applications that require nonlinear signal compression, such as in speech recognition front-ends (SRFEs) and cochlear implants or bionic ears (BEs). A logarithmic current-input analog-to-digital converter (A/D) with temperature compensation and automatic offset calibration is presented in this paper. It employs a diode to compute the logarithm, a wide linear range transconductor to perform voltage-to-current conversion, and a dual-slope auto-zeroing topology with 60 dB of dynamic range for sampling the envelope of speech signals. The temperature dependence of the logarithm inherent in a diode implementation is automatically cancelled in our circuit topology. Experimental results from a 1.5-μm 3-V BiCMOS process show that the converter achieves a temperature stability lower than 150 ppm/℃ from 12℃ to 42℃, and consumes only 3μW of power when sampling at 300 Hz. At this level of power consumption, we show that the design is thermal-noise limited to 8 bits of precision. This level of precision is more than adequate for deaf patients and for speech recognition front-ends. The power consumption is almost two orders of magnitude lower than state-of-the-art DSP implementations, and the use of a local feedback topology achieves a 2.5-bit improvement over conventional dual-slope designs.
机译：对数电路可用于许多需要非线性信号压缩的应用中，例如语音识别前端（SRFE）和人工耳蜗或仿生耳（BE）。本文提出了一种具有温度补偿和自动失调校准功能的对数电流输入模数转换器（A / D）。它使用一个二极管来计算对数，使用一个宽线性范围的跨导体来执行电压到电流的转换，并采用具有60 dB动态范围的双斜率自动归零拓扑来对语音信号的包络进行采样。二极管实现中固有的对数的温度依赖性在我们的电路拓扑中自动消除。 1.5μm3V BiCMOS工艺的实验结果表明，该转换器在12℃至42℃的温度范围内具有低于150 ppm /℃的温度稳定性，在300 Hz采样时仅消耗3μW的功率。在这种功耗水平下，我们表明设计的热噪声仅限于8位精度。对于耳聋患者和语音识别前端来说，这种精确度是绰绰有余的。与最新的DSP实现相比，功耗几乎降低了两个数量级，与传统的双斜率设计相比，使用本地反馈拓扑可实现2.5位的改进。

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