High speed ADC based data acquisition system for TOF-SIMS

Abstract

This article designed a data acquisition system for Time-of-Flight Secondary Ion Mass Spectrometer(TOF-SIMS). The system uses high speed Analog-to-Digital conversion(ADC) for sampling of analog signals. The timing controller is FPGA. The DDR3 SDRAM is used to store massive amounts of data. PCI-Express(PCIE) bus is used to communicate with computer，and the ADC dynamic performance and PCI-Express bus read and write speed are tested. The results show that the system acquires the sine wave with the frequency of 400 MHz, the signal to noise ratio of ADC is 56.333 dB, the total harmonic distortion is -63.509 dB, the effective number is 8.995 bit，and PCI-Express bus has write speed of 1 135 MB/s and read speed of 1 002 MB/s，which meet needs of the TOF-SIMS.

Keywords

• TOF-SIMS
• high speed data acquisition
• high speed ADC
• PCI-Express bus