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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。
I. INTRODUCTION Four-quadrant analog multiplier is an important element in nonlinear system and can be used for signal modulation, detection, control, square and square root, and has a wide range of uses in analog signal processing. Currently, bipolar four-quadrant analog multipliers still dominate. In this paper, a new four-quadrant CMOS analog multiplier is proposed, which directly uses the exponential relationship between current and gate voltage of the MOS transistor in the secondary turn-on area to realize the exponential relationship in the bipolar circuit, which constitutes the Gilbert cell four-quadrant simulation Multipliers, whose accuracy and linearity can reach or exceed even bipolar multipliers.