基于PC/104等效采样电路的设计

特等效采样技术(利用普通的A／D芯片和低速存储器代替价格昂贵的高位超高速A／D芯片和超高速存储器，实现超高速数据采集的新技术)应用到瞬变电磁法(TEM)探测仪上，使TEM接收机采样率从500kHz提高到500MHz，从而克服了由于TEM探测仪采样率低(500kHz或更低)而容易丢失瞬变信号的甚早期有用信号这一难题。整个采样系统由PC／104来控制，充分利用了Borland C 嵌入汇编的优点，节省了CPU因大量乘法运算而耗费的时间。给出了该系统的实现原理、硬件设计及等效算法的设计与实现等。

Equivalent sample circuit based on PC/104

The equivalent sampling technology is a new technology which uses norm al ADC(A/D Chip) and slow RAM to realize the ultra-high speed sampling that tra ditionally can be realized by using costly high-bits ultra-high speed ADC and f lash RAM. Such new technology has been applied to the TEM(Transient Electromagnetic Method s) detector,which has improved the TEM Receiver's sampling rate from 500 kHz to 500 MHz thus a difficulty has been conquered which results from the slow sampli ng rate that it is prone to lose the very early useful signals in the transient cha ngeable waves.The whole sampling system is controlled by PC/104, a lot of mult iplication operation has been avoided by fully using the advantage of Borland C+ +,time was saved by the CPU's avoiding multiplication operation. This system's theory realized,hardware designed and the design and the realize of equivale nt sampling arithmetic are all given.