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现代蜂窝电话必须工作在许多讨厌的无用信号之中。在一个典型的移动电话中，信号幅度可能仅有０．３５ｕＶ一比邻近的噪声幅度低１００ｄＢ以上。为将此信号放大到适于解调的电平。蜂窝电话通常采用一个中间频率（ＩＦ）单元来提供超过８０ｄＢ的增益。为满足误码率（ＢＥＲ）
Modern cellular phones must work in many annoying, unwanted signals. In a typical mobile phone, the signal amplitude may be only 0.35uV-100dB lower than the adjacent noise amplitude. To amplify this signal to a level suitable for demodulation. Cellular phones typically use an intermediate frequency (IF) unit to provide more than 80dB of gain. To meet the bit error rate (BER)