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A parallel input composite transimpedance amplifier.

D J Kim1, C Kim1

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of KoreaDepartment of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea.

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Summary
This summary is machine-generated.

A novel current-to-voltage preamplifier design offers high performance with parasitic capacitance compensation. This design ensures wide bandwidth stability for demanding measurements like scanning tunneling microscopy.

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Area of Science:

  • Electrical Engineering
  • Instrumentation Science

Background:

  • High-performance current-to-voltage (I/V) preamplifiers are crucial for precision measurements.
  • Existing designs often struggle with stability and noise in the presence of significant input capacitance.

Purpose of the Study:

  • To present a new I/V preamplifier design achieving high performance.
  • To address limitations of existing designs regarding parasitic capacitance and stability.

Main Methods:

  • Utilized a composite amplifier topology with multiple operational amplifiers (op-amps).
  • Incorporated a parasitic capacitance compensation network.
  • Employed a parallel-linked JFET op-amp input stage and a high-speed bipolar junction transistor (BJT) gain stage.

Main Results:

  • Achieved fast, precision, and low-noise performance.
  • Ensured wide bandwidth stability with input capacitance exceeding 40 nF.
  • Demonstrated suitability for two-probe measurements.

Conclusions:

  • The novel preamplifier design offers robust performance for high-impedance measurements.
  • The design is particularly well-suited for applications such as scanning tunneling microscopy.