Excitation Frequency Effect of Differential Capacitance Transducer for Equivalence Principle Test

摘要

We discuss effects of the excitation frequency in an ac bridge differential capacitance transducer for the equivalenceprinciple test on the frequency-dependent characteristics of a practical operational amplifier, the thermal noise limitation, and stray-immune. Basic requirements of choosing the excitation frequency of the ac bridge capacitance transducer are given based on the three effects, which are significant for designing a capacitance transducer and choosing proper electric elements.