数字助听器四阶CT σ δ反馈DAC非线性的动态校准

2011 IEEE International SOC Conference Pub Date : 2011-11-21 DOI:10.1109/SOCC.2011.6085129

S. R. Naqvi, I. Deligoz, S. Kiaei, B. Bakkaloglu

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引用次数: 0

摘要

在本文中，我们提出了一种校准方案，用于校准用于四阶CT的反馈DAC的二阶谐波失真-ΣΔ。该方案在0.25um CMOS工艺中实现，电源电压为1.2V, 4阶CT-ΣΔ能够达到68dB的测量信噪比，而2阶谐波降低了约20dB，将其抑制到热噪声底。

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Dynamic calibration of feedback DAC non-linearity for a 4th order CT sigma delta for digital hearing aids

In this paper we present a calibration scheme for calibrating the 2^nd order harmonic distortion of feedback DAC used in a 4^th order CT-ΣΔ. This scheme was implemented in a 0.25um CMOS process with a supply voltage of 1.2V, the 4^th order CT-ΣΔ was able to achieve 68dB measured SNR, while the 2^nd order harmonic was reduced by about 20dB suppressing it to the thermal noise floor.

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2011 IEEE International SOC Conference

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