3 small signal amplifier的用法和樣例：
例句
- TWT plays an important role as high power and wide band microwave generator and microwave amplifier.
行波管作為高功率寬頻帶的微波源和重要的微波信號放大器在相關行業中具有不可替代的地位。 - Finally I got the spare piezoelectric transducers and finished some simple high-impedance signal amplifiers.
最後我得到了備件壓電感測器和完成一些簡單的高阻抗信號放大器。
