結合地震儀應用環境的特殊性，借鑒國內外地震儀器的設計經驗，本文基于24 位Δ-ΣADC 技術，以24 位Δ-ΣA/D 轉換套片CS5371/CS5372、CS5376 為核心設計并實現了大
動態范圍的地震數據采集系統；并將FPGA 應用于A/D 接口電路的設計，減小了系統硬件體積，提高了系統的可靠性以及升級維護的方便性；而且設計了系統測試電路，使得儀器具有現場自我診斷檢測能力，方便了儀器在野外的應用。最后，對樣機進行測試的結果證明了本文設計完全符合寬頻地震儀的設計要求。
關鍵詞：數據采集；寬頻地震儀；FPGA；24 位Δ-ΣADC
Abstract: Combined with the special application environment, referred to the design experience, and based on the techniques of 24bit Δ-ΣA/D, seismic data acquisition system with large dynamic range is realized by the 24bit Δ-Σ conversion set (CS5371/CS5372 and CS5376). The less volume, higher reliability and convenient upgrade and maintenance have been realized using FPGA in the A/D interface circuit. In addition, the test circuit makes the field self-diagnosis and more convenient field application of the instrument possible. Last, the prototype has been finished, and the primary test results are given.
Keyword: Data acquisition; broad-band seismograph; FPGA; 24bit Δ-ΣADC