Low-Noise High-Gain Large-Bandwidth Transimpedance Amplifier with Cascode-Type Preamplifier for Cryogenic STM.
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| Title: | Low-Noise High-Gain Large-Bandwidth Transimpedance Amplifier with Cascode-Type Preamplifier for Cryogenic STM. |
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| Authors: | Liang, Ying-Xin1 (AUTHOR) cryoliang@qq.com |
| Source: | Journal of Low Temperature Physics. Jan2023, Vol. 210 Issue 1/2, p357-375. 19p. |
| Subjects: | Preamplifiers, Modulation-doped field-effect transistors, Scanning tunneling microscopy, Quantum noise, Thermal noise, Coplanar waveguides |
| Abstract: | A low-noise high-gain large-bandwidth transimpedance amplifier (TIA) for cryogenic scanning tunneling microscope (CryoSTM) is proposed. The TIA connected with the tip-sample component in CryoSTM is called as CryoSTM-TIA. The CryoSTM-TIA has a transimpedance gain of 10 G Ω , a bandwidth of over 100 kHz, and an equivalent input noise current power spectral density less than 4 (fA) 2 / Hz at 100 kHz. The low inherent noise of the CryoSTM-TIA is due to its special design: (1) its pre-amplifier (Pre-Amp) is made of the low-noise cryogenic high electron mobility transistors; (2) the cascode-type configuration for the Pre-Amp is used to avoid Miller effect to reduce its input capacitance C A ; (3) the capacitance of the cable connected the Pre-Amp input to the tip, i.e., C I , is minimized; (4) thermal noise sources, such as the feedback resistor, are placed in the cryogenic zone. Its high gain and large-bandwidth are realized together, due to the application of the frequency compensation in the feedback loop, the reduced C A , and the minimized C I . This apparatus can be used for fast high-energy-resolution measurements of scanning tunneling spectra for low conductivity materials, especially for measuring their scanning tunneling shot noise spectra. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | A low-noise high-gain large-bandwidth transimpedance amplifier (TIA) for cryogenic scanning tunneling microscope (CryoSTM) is proposed. The TIA connected with the tip-sample component in CryoSTM is called as CryoSTM-TIA. The CryoSTM-TIA has a transimpedance gain of 10 G Ω , a bandwidth of over 100 kHz, and an equivalent input noise current power spectral density less than 4 (fA) 2 / Hz at 100 kHz. The low inherent noise of the CryoSTM-TIA is due to its special design: (1) its pre-amplifier (Pre-Amp) is made of the low-noise cryogenic high electron mobility transistors; (2) the cascode-type configuration for the Pre-Amp is used to avoid Miller effect to reduce its input capacitance C A ; (3) the capacitance of the cable connected the Pre-Amp input to the tip, i.e., C I , is minimized; (4) thermal noise sources, such as the feedback resistor, are placed in the cryogenic zone. Its high gain and large-bandwidth are realized together, due to the application of the frequency compensation in the feedback loop, the reduced C A , and the minimized C I . This apparatus can be used for fast high-energy-resolution measurements of scanning tunneling spectra for low conductivity materials, especially for measuring their scanning tunneling shot noise spectra. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00222291 |
| DOI: | 10.1007/s10909-022-02855-0 |
