请教下大家,由于接收的信号动态范围很大,我们选用VCA810,但是测试结果只能到-26到28dB,远远达不到±40dB,放大大概在给电压大于-1.7V的时候就开始出现自激振荡了,下面是电路图还有测试结果,请大家帮忙看看,谢谢各位!
输入50mV正弦波,当压控信号大于-1.7V开始就开始变成下图了
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请教下大家,由于接收的信号动态范围很大,我们选用VCA810,但是测试结果只能到-26到28dB,远远达不到±40dB,放大大概在给电压大于-1.7V的时候就开始出现自激振荡了,下面是电路图还有测试结果,请大家帮忙看看,谢谢各位!
输入50mV正弦波,当压控信号大于-1.7V开始就开始变成下图了