一种基于次开启特性的CMOS四象限模拟乘法器

<正> 一、引言 四象限模拟乘法器是非线性系统中的一个重要单元,可用于信号的调制、检测、控制、平方及求平方根,在模拟信号处理中具有广泛的用途。目前,双极型四象限模拟乘法器仍占据主导地位。本文提出一种新的CMOS四象限模拟乘法器,它直接利用MOS晶体管工作在次开启区电流与栅电压所呈的指数关系来实现类似双极型电路中的指数关系,构成Gilbert单元四象限模拟乘法器,其精度和线性可以达到甚至超过双极型乘法器。

A Four-Quadrant CMOS Analog Multiplier Based on Subthreshold Operation

A new circuit configuration of an MOS analog multiplier based on the subthreshold operation of MOS transistors is proposed in this paper. The novel technique employs the exponential characteristics instead of the square-law characteristics for realizing the four-quadrant analog multiplier. Analysis and experiments show that the four -quadrant CMOS analog multiplier based on subthreshold operation has the advantages of micro-power, high-precision and small-nonlinearity.