Design of High-precision Broadband Closed-loop Driving Power on Dielectrophoresis

Abstract

With the development and application of Biological chips and sensors, the demand for high-precision broadband driving power is increasingly rigorous. In order to improve the precision and reliability of the driving power, a high precision broadband closed-loop signal generator has been designed. It works by the high-accuracy amplitude detection circuit, the broadband voltage controlled amplifier and a micro-controller. The principles of amplitude detection circuit and amplifier circuit have been elaborated. Within 1 MHz ~ 200 MHz band, within 1 ~ 10 VPP amplitude range, under 50 Ω output impedance, the error of output signal amplitude can be controlled effectively. Precision is up to 0.15%. It meets the index and scientific research’s requirement.