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求音频放大电路

Other Parts Discussed in Thread: UAF42, OPA627

前级放大0-100倍可调--------滤波(3-20KHZ待定)-------后级放大0-100倍可调------录音存储(采样率48KHZ  24位)求推荐高性能的底噪平稳的芯片,现在用的滤波器是UAF42,前后级放大都是AD797,不知道为什么,放大后底噪是波浪形的,极不平稳,类似于音频处理软件低音增强后的效果,百思不得其解。求推荐放大器和滤波器的芯片,最好是单电源供电3.3V锂电供电。会做的直接留联系方式,感谢费大大的。