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发明公开
CN104485894A 一种用于运算放大器共模电平偏移的处理电路及其方法 无效 - 驳回

一种用于运算放大器共模电平偏移的处理电路及其方法
摘要：
本发明实施例公开了一种用于运算放大器共模电平偏移的处理电路及其方法，其中，所述处理电路包括：缓冲器，用于对接收到的信号进行缓冲处理，加强信号的驱动能力；第一滤波电路，用于对经过所述缓冲器处理后的信号进行带通滤波；第一运算放大器，用于对所述缓冲器进行带通滤波后的信号进行信号放大；第二滤波电路，用于对所述信号放大器进行信号放大后的信号进行带通滤波，获得滤波后的信号。实施本发明实施例，可以解决射频天线无线传输的信号经过运算放大器放大时，出现运算放大器的输入端输出端共模电平的偏移问题，可以使得输出信号在同一共模电平上，方便后面的数字信号处理，避免了出现信号误码的错误。
摘要（英）：

The embodiment of the invention discloses common-mode level shift treatment circuit and method for an operational amplifier. The treatment circuit comprises a buffer for buffering a received signal so as to improve the driving capacity of the signal, a first filter circuit for performing band-pass filtering for the signal processed by the buffer, a first operational amplifier for amplifying the signal processed by the buffer and subjected to band-pass filtering, and a second filter circuit for performing band-pass filtering for the signal amplified by the signal amplifier so as to obtain a filtered signal. By adopting the treatment circuit, the problem of common-mode level shift at the input end and the output end of the operational amplifier during amplifying a signal transmitted through an RF antenna by a wireless manner through the operational amplifier can be solved; the output signals can be kept in the same common-mode level, which facilitates the subsequent treatment on digital signals, and moreover, signal error code can be avoided.

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