LF-band noise in MOSFET in low-power operation

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Description

Noise performance of a commercial MOSFET was evaluated for the amplifier application in LF-band. The level of 1/f noise referred to the gate was about -126 dbV/Hz at 1 Hz and was proportional to f -0.9 . At 100 kHz noise was white and was equivalent to the thermal noise from 1 kΩ and 100 kΩ at the drain current of 100 μA and 1 μA, respectively. 2SK1771 is acceptable as the amplifying device connected to a tuning circuit whose resonant impedance is more than the values stated above.

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