Other Parts Discussed in Thread: OPA695, OPA820
输入是100Khz,Vpp=0.2V.
VCA821配置的是最大增益Vgainmax =2
OPA695的增益是5
想让sin波形稳定在1V,所以,OPA820的正端参考电压给1V
示波器显示的结果很奇怪,尤其是Vg脚电压,按照手册芯片工作Vg电压是0~2V,仿真示波器看 >4V,AGC环路没有工作。
仿真文件在附件VCA821_AGC仿真.TSC
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输入是100Khz,Vpp=0.2V.
VCA821配置的是最大增益Vgainmax =2
OPA695的增益是5
想让sin波形稳定在1V,所以,OPA820的正端参考电压给1V
示波器显示的结果很奇怪,尤其是Vg脚电压,按照手册芯片工作Vg电压是0~2V,仿真示波器看 >4V,AGC环路没有工作。
仿真文件在附件VCA821_AGC仿真.TSC