Signal dynamic range expansion and power supply voltage reduction for an exponentiation conversion IC

IF 1.2 4区工程技术 Q4 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Analog Integrated Circuits and Signal Processing Pub Date : 2024-02-19 DOI:10.1007/s10470-023-02247-8

Naoya Nishiyama, Fumiya Matsui, Yuji Sano

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Abstract

In order to compensate for the non-linearity of an electronic device, an exponentiation conversion circuit that can change the power exponent to any value has been proposed. The exponentiation conversion circuit multiplies the logarithmically converted input signal by a power exponent value to perform exponential conversion. As a result, we can obtain the power function characteristic of a power exponent value. This circuit is a small-scale circuit that utilizes the exponential characteristics of the MOSFET subthreshold region. In a conventional circuit, expansion of the signal dynamic range and reduction of the power supply voltage have been an issue. In this paper, it was confirmed by simulation that the signal dynamic range has expanded by optimizing the current density of MOSFETs. In addition, the linearity of the multiplying circuit was improved by feedback produced by the operational amplifier circuits. We proposed reducing its power supply voltage from 6.0 to 3.3 V by a new multiplying circuit that can eliminate the restriction of maximum voltage gain. Our circuit expands its signal dynamic range from 17.5 to 42.7 dB in condition of the power exponent value from 0.50 to 2.0.

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为指数转换集成电路扩展信号动态范围并降低电源电压

摘要为了补偿电子设备的非线性，提出了一种可将幂指数变为任意值的幂指数转换电路。幂指数转换电路将对数转换后的输入信号乘以一个幂指数值，进行指数转换。因此，我们可以获得幂指数值的幂函数特性。该电路是一种利用 MOSFET 亚阈值区指数特性的小型电路。在传统电路中，扩大信号动态范围和降低电源电压一直是个问题。本文通过仿真证实，通过优化 MOSFET 的电流密度，信号动态范围得以扩大。此外，通过运算放大器电路产生的反馈，乘法电路的线性度也得到了改善。我们建议采用新的乘法电路，将其电源电压从 6.0 V 降至 3.3 V，以消除最大电压增益的限制。在功率指数值从 0.50 到 2.0 的条件下，我们的电路将信号动态范围从 17.5 dB 扩大到 42.7 dB。

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来源期刊

Analog Integrated Circuits and Signal Processing 工程技术-工程：电子与电气

CiteScore

0.30

自引率

7.10%

发文量

141

审稿时长

7.3 months

期刊介绍： Analog Integrated Circuits and Signal Processing is an archival peer reviewed journal dedicated to the design and application of analog, radio frequency (RF), and mixed signal integrated circuits (ICs) as well as signal processing circuits and systems. It features both new research results and tutorial views and reflects the large volume of cutting-edge research activity in the worldwide field today. A partial list of topics includes analog and mixed signal interface circuits and systems; analog and RFIC design; data converters; active-RC, switched-capacitor, and continuous-time integrated filters; mixed analog/digital VLSI systems; wireless radio transceivers; clock and data recovery circuits; and high speed optoelectronic circuits and systems.