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.
Highlights
With the development and application of Biological chips and sensors, the demand for high-precision broadband driving power is increasingly rigorous
The design of highprecision, broadband, closed-loop driving power system is proposed. It mainly consists of AD9953, DDS (Direct Digital Synthesis) chip, high-precision amplitude detection circuit, broadband voltage controlled amplifier and STM32 microcontroller
According to the experimental requirements, the design index shows as follow: !The output frequency ranges from 1 MHz to 200 MHz; "The peak-to-peak output voltage amplitude ranges from 1V to 10V, and the absolute amplitude error is less than 3 mV; #Output impedance matches 50 !
Summary
With the development and application of Biological chips and sensors, the demand for high-precision broadband driving power is increasingly rigorous. It has relationship to the development and progress of biotechnology [1,2,3,4]. The design of highprecision, broadband, closed-loop driving power system is proposed. It mainly consists of AD9953, DDS (Direct Digital Synthesis) chip, high-precision amplitude detection circuit, broadband voltage controlled amplifier and STM32 microcontroller. According to the experimental requirements, the design index shows as follow: !The output frequency ranges from 1 MHz to 200 MHz; "The peak-to-peak output voltage amplitude ranges from 1V to 10V, and the absolute amplitude error is less than 3 mV; #Output impedance matches 50 !
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