是用高速低噪运放来构建还是用场效应管来构成高频调谐放大器;用运放的话好像增益带宽积又达不到,用场效应又不知如和选择合适的。
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这么高的增益带宽积肯定需要多级运放来实现了。
如果您的被测信号是交流信号的话,那么如果担心offset造成的影响, 可考虑在运放的输出端加上电容来消除。