| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-step amplification circuit which acquires a necessary circuit gain and a frequency characteristic and achieves a cost reduction even reducing the number of a circuit element. SOLUTION: The amplification circuit is provided with a detector to detect an input signal and a feedback amplification circuit to be connected to the detector and to amplify its output current. The amplification circuit is provided with a voltage dividing resistance set between the output of the amplification circuit and a reference potential, connects one end of the voltage dividing resistance to the output side, connects the resistance of the feedback amplification circuit to a dividing point of the voltage dividing resistance, and connects the other end of the voltage dividing resistance to the input of the feedback amplification circuit. The number of the circuit element is reduced, the necessary circuit gain and the frequency characteristic are acquired, and the cost reduction is achieved, by the above composition. COPYRIGHT: (C)2007,JPO&INPIT
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