![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282097337525092253socntzdz3rhcm8r4.png)
V1、V2特性一致,中间抽头,通常设N1=N2,u1为大信号,控制二极管开关工作,u2为小信号。
电路分析:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282113942448092539pdtpmd2mhf222t2m.png)
这相当于不考虑uo对二极管的作用,但将二极管等效看成gD时的分析结果:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/17228212156158092655cy6p7722dsd2paax.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282125551385092735xocy22gy2gxezg33.png)
二极管平衡相乘器输出信号的频谱:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282129615245092816htqq04eco4flyexq.png)
可以看出:比之单管电路,无用频率分量又少很多。w1及其各次谐波均被抑制,且易滤除无用频率分量。
2、二极管双平衡相乘器
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282144580263093045t58o1lrujnuj5z9w.png)
V1~V4特性一致 中间抽头,通常设N1=N2,u1为大信号,控制二极管开关工作,u2为小信号。
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282165577735093415hyjadp6gdnu8zr3d.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282162496226093344xa3jedwwzae0vqqu.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282168950063093449lgomxob977m99otu.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282173121812093531fiozxoz4l11l8zpo.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/17228217647399093604reraumd1alfuk8ur.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282178898479093628fllim4ninyhnkllk.png)
二极管双平衡相乘器输出信号的频谱:
可见:只含有w1各奇次谐波与w2的组合频率分量,且很容易滤除无用分量。接近理想相乘器。
把电路改画为:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282189290837093812vtf9ouzfhzzfssfj.png)
四个二极管组成一个环路,且二极管极性沿环路一致,故又称为环型相乘器。若二极管特性一致,变压器中心抽头上下完全对称,则各端口间良好隔离。信号分别从其中两个端口输入,则另一端口为相乘器输出端。
3、双差分对模拟相乘器
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282198584118093945e6wc6on6qcz63263.png)
静态分析:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282201446467094014cwwreazqfwzwt68s.png)
动态分析:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282216990188094249qvli8tv5vvvm7umu.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282211841573094158f899p9shyyyc8s11.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282220890560094328ql4a8m337tl3fruf.png)
4、MC1496/1596集成模拟相乘器
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282227860462094438blyaxp46lylq6669.png)
电路分析:
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282236019550094600grz5kk4r5b0orejk.png)
5、MC1595集成模拟相乘器
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282239633087094636gdi6swacrvs8806r.png)
![image.png image.png](https://static.assets-stash.eet-china.com/forum/202408/05/172282242748245094707j5nzmux0k88wnf5k.png)