摘要
介绍了一种应用于生物微阵列中，工作频率为10～20MHz的超声聚焦微喷压电换能器射频电源的设计。该射频电源采用基于直接数字频率合成（DDS）技术得到波谱纯净，频率连续可调，幅值可调，分辨率高且稳定的射频信号。采用具有可关断功能的视频运算放大器实现了一种简单实用、低成本的脉冲调制电路。功率输出级采用变压器推挽式功率放大电路，实现了宽带脉冲调制信号的功率有效放大。
This paper introduces a design of 10～20 MHz RF power supply for focused ultrasonic micro-jetung piezoelectric transducer in biological micro-arrays. This RF supply is based on DDS technology and produces a spectrally pure, frequency/phase programmable, amplitude adjustable, high output tuning resolution, analog output stable sine wave. And a simple low-cost practicable pulse modulation method is achieved by a video amplifier with shutdown. At the power stage, a two-stage transformer coupled push-pull RF amplifier is applied and generates the output required power of pulse modulation.
出处
《压电与声光》
CSCD
北大核心
2008年第1期45-47,共3页
Piezoelectrics & Acoustooptics
