| 摘要 |
An amplifier circuit includes three amplifier units connected in series. The first amplifier unit includes an input connector for inputting signals and a first transistor amplifier module connected to the input connector. The second amplifier unit includes a notch-filter circuit, a main filter circuit and a second transistor amplifier module. The notch-filter circuit allows only signals in a predetermined frequency to be transmitted from the first transistor amplifier module to the second transistor amplifier module and amplified. The main filter circuit filters signals in frequencies different from the predetermined frequency. The third amplifier unit includes a third transistor amplifier module and an output connector for outputting amplified signals.
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