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A low-noise and wide-band ac boosting current-to-voltage amplifier for scanning tunneling microscopy

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2 Author(s)
Kim, Dae-Jeong ; Korea Research Institute of Standards and Science, P.O. Box 102, Yuseong, Daejeon 305-600, Korea ; Koo, Ja-Yong

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A compact, fast, and low-noise current-to-voltage amplifier is built for scanning tunneling microscopy. The amplifier consists of two amplification stages. The first stage performs low-noise transimpedance amplification by using a high performance FET operational amplifier together with a high-ohm feedback resistor of 1 GΩ and a parallel trimming capacitor. The ac boosting amplifier in the second stage recovers the higher frequency above the 3 dB cutoff of the first stage to extend the maximum bandwidth up to 100 kHz. This two-stage current-to-voltage amplifier shows a low current noise below sub-pA rms when tuned to have the bandwidth of around 1 kHz. It also guarantees stable frequency response in the presence of 1000 pF input capacitance.

Published in:

Review of Scientific Instruments  (Volume:76 ,  Issue: 2 )