【摘要】 本文对两输入端都带噪声情况下乘法器的响应进行了理论推导,得到其噪声模型:乘法器输出噪声包括载波携带信号噪声项、信号携带载波噪声项以及噪声相乘项。设计传感器电路时,通过提高载波纯度及其幅度、在信号输入端加性能优良的带通滤波器,可以得到优异的噪声性能。本文用实验验证了该模型的正确性。更多还原

【Abstract】 Multiplier is widely used in high performance sensors and communication receiver.This paper analyzes the noise in the multiplier in theory and experiment.A model is proposed for calculate the output noise of the multiplier.It is found that the output noise includes three parts,noise from the carrier multiplied by signal,noise from signal multiplied by the carrier,and the multiplying of the noise from the carrier and signal.To obtain low noise in the output,it is important to make the carrier very pure and with noise as littler as possible,and a high performance band-pass filter is necessary for the signal inputting to the multiplier.更多还原