| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifying circuit which can remove a 1/f noise and a high-frequency noise. SOLUTION: A signal equal to or less than a cutoff frequency of a low-pass filter 41 and equal to or more than a cutoff frequency of a high-pass filter 42 of a signal amplified by an MOSFET 28 is outputted to an amplifier at a subsequent stage. At this time, a 1/f noise of a lower frequency than the cutoff frequency of the high-pass filter is blocked, and a noise of a higher frequency than the cutoff frequency of the low-pass filter 41 is also blocked. Thus, the 1/f noise and the noise of high frequency is removed, and a signal of a desired frequency is amplified. COPYRIGHT: (C)2004,JPO
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