基于模拟乘法器MC1496的混频器设计解读

基于模拟乘法器MC1496的混频器设计

摘要

集成模拟乘法器是继集成运算放大器后最通用的模拟集成电路之一，是一种多用途

的线性集成电路。可用作宽带、抑制载波双边平衡调制器，不需要耦合变压器或调谐电路，还可以作为高性能的SSB乘法检波器，AM调制/解调器、FM解调器、混频器、倍频器、鉴相器等，它与放大器相结合还可以完成许多的数学运算，如乘法、除法、乘方、

开方等。

本设计主要应用集成模拟乘法器MC1496实现以上功能。

模拟乘法器的主要技术指标是工作象限、线性度和馈通度。工作象限是指容许输入

变量的符号范围。只容许ux和uy均为正值的相乘器称为一象限的,而容许ux和uy都可以取正、负值的则称为四象限的。线性度是指相乘器的输出电压uo与输入电压ux(或uy)成线性的程度。馈通度是指两个输入信号中一个为零时，另一个在输出端输出的大小。

混频是将载波为高频的已调信号，不失真地变换为载波为中间的已调信号，必须保持①

调制类型，调制参数不变，即原调制规律不变。②频谱结构不变，各频率分量的相位大小，相互间隔不变。

由于设计和制作增益高,选择性好,工作频率较原载频低的固定中频放大器比较容易,所以采用混频方式可大大提高接收机的性能。此设计就是利用仿真软件，采用模拟相乘

器实现混频电路的。

关键词：MATLAB,模拟乘法器，混频电路

DESING OF MIXER BASED ON THE ANALOG MULTIPLIER MC1496

Abstract

Aftertheintegrated operational amplifier i n theintegrated analogmultiplier isone of themost

common analog integrated circuit, is a kind of multi-purpose linear integrated circuits.Modulato can be used as a broadband, suppressed carrier bilateral balance, don't need coupling transforme

detector,AM,FM

or tunedcircuit,alsocan be used as a high-performance S SB multiplication

demodulator, mixer/modem modulation, frequency multiplier, and phase discriminator, combining

division,

itwith amplifier can alsodo many mathematical operation,s uch as multiplication,

chengfang, root, etc.

This designmainly used integrated a nalog multiplier M C1496achieveabove functions.

Analog multiplier isthemain technique indexquadrant,linearity and feedthroughwork.Work

quadrantrefers to allow the inputvariable symbol scope.Onlyallow both ux and uy positive

multiplier iscalled a quadrant,and allow the ux and uy can takethe positive a nd negative is

known as the four quadrants.Linearity refers to the multiplication of the input voltage and outp voltage uo ux (or uy) into linear degree.Feed through degree is refers to the two input signals is equal to zero, the other in the size of the output terminal output.Mixing is the carrier for frequencymodulated signal,no distortion for the carrier to transformto the middle of the

modulated signal,m ust be kept in(1)modulationtype,modulationparameters are the same,

namely the original modulation law remains the same.The phase of each frequency component of

the spectrum structure remains the same, (2) the size and the spacing between the same.

Due to the design and production of high gain, good selectivity, and working frequency was lower than those of the original carrier frequency fixed intermediate frequency amplifier is easy, so mixing method can greatly improve the performanceof the receiver.This designisthe use of

simulation software, using analog multiplier to realize mixing circuit..

Key words:MA TLAB, Analog multiplier, mixing circuit