.6 Gsps Digital Oscilloscope Key Technology Research

With the development of modern communication and the improvement of testing technology, a higher bandwidth and sampling rate digital oscilloscope is required by developers.The dissertation introduces the crucial techniques concerning the 6Gsps digital oscilloscope, including high speed data acquisition technology, parallel ADCs sampling technology, trigger systems and high-speed signal integrity issues. The implementation scheme of system is advanced, and the acquisition and trigger system is accomplished. The problems occurring during designing and debugging are analyzed and solved.The primary works in this dissertation are presented as follows:1. The design of data acquisition system. It is the core of Digital Oscilloscope. This 6Gsps sampling rate system is based on a mosaic method of two ADCs and multi-channel data storage technique. The techniques of two ADCs alternating sampling as well as four-way data stream parallel storage for each chip, which used the ADC+FPGA+DSP architecture can reduce data transmission of each channel efficiently and also store large amounts of data opportunely.2. The acquisition control modules in Oscilloscope. The circuit modules of time base, peak detection, hardware cymometer and the configuration of peripheral devices are introduced simply in this article. They are controlled by words which come from DSP and the timing in the FPGA.3. Trigger system. Trigger circuit can ensure that the input signal be sampled by an accurate point and display stable waveform. This article introduces the edge trigger, pre-trigger, pos-trigger and video trigger.4. Finally, this article analyzes high-speed signal integrity issues which may occur in high-speed PCB. The problems during designing and debugging are analyzed and solved.