HIGH-RESOLUTION DC-VOLTAGE-BIASED AC CONDUCTANCE BRIDGE FOR TUNNEL JUNCTION MEASUREMENTS

被引：15

作者：

MOODY, MV

PATERSON, JL

CIALI, RL

机构：

[1] Physics Dept., University of Virginia, Charlottesville

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1979年 / 50卷 / 07期

关键词：

D O I：

10.1063/1.1135947

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A simple, low-cost conductance bridge circuit, which provides high-resolution measurements of dI/dV and d2I/dV2 for a voltage-biased load, is presented. A resolution in dI/dV for a 90-Ω tunnel junction of several parts in 105 has been measured using a 35-μV-rms modulation level and a 1-s postdetection time constant (B n = 0.25 Hz). The output impedance of the voltage source and the error in the conductance measurement are discussed. The output impedance of the circuit with an AD119 operational amplifier is 0.02 Ω. A detailed discussion of Johnson-Nyquist, tunnel junction, and amplifier noise is presented.

引用

页码：903 / 908

页数：6

共 9 条

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