Circuits for differential signal extraction in the lock_in amplifiers

20th International Conference for Students and Young Scientists: Modern Techniques and Technologies

工业技术;材料科学

Baranov, P.^1 ; Bukrina, T.^1

National Research Tomsk Polytechnic University, Tomsk

634050, Russia^1

关键词: Common mode rejection ratio;    Differential signal;    Lock-in amplifier;    Maximum accuracies;    Measurement instruments;    Measuring transducers;    Metrological characteristics;    Wide dynamic range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/66/1/012007/pdf
DOI  :  10.1088/1757-899X/66/1/012007

来源: IOP

【 摘 要 】

Confirmation of the metrological characteristics of measuring transducers provides maximum accuracy of the method of comparison with the standard instrument. Practical application of this technique is impossible without accurate instruments. As a measurement instrument to ensure the resolution of the order of several nanovolts when comparing two AC signals over a wide dynamic range, widely used lock-in amplifier with a differential input. The paper presents the results of the analysis of circuits based on operational amplifiers for comparing two signals and extraction differential signal in lock-in amplifier with a differential input. Common-mode rejection ratio for each of the circuits was estimated.