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島根医科大学紀要 Volume 18
published_at 1995-12-01
Grimblebyのフィルター回路を利用した2相ロックイン・アンプ
Two-Phase Lock-In Amplifier Using Grimbleby's Averaging Filter Circuits
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Descriptions
A two-phase lock-in amplifier has been constructed, using Grimbleby's averaging filter switched capacitor and a PLL circuit. The band pass frequency is locked to an external frequency reference. The unit has a frequency response from 5 Hz to 1 KHz and surpasses the performance of commercial products in regard to the response to a modulated signal and the measurement rate.
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