結(jié)合地震儀應(yīng)用環(huán)境的特殊性，借鑒國(guó)內(nèi)外地震儀器的設(shè)計(jì)經(jīng)驗(yàn)，本文基于24 位Δ-ΣADC 技術(shù)，以24 位Δ-ΣA/D 轉(zhuǎn)換套片CS5371/CS5372、CS5376 為核心設(shè)計(jì)并實(shí)現(xiàn)了大
動(dòng)態(tài)范圍的地震數(shù)據(jù)采集系統(tǒng)；并將FPGA 應(yīng)用于A/D 接口電路的設(shè)計(jì)，減小了系統(tǒng)硬件體積，提高了系統(tǒng)的可靠性以及升級(jí)維護(hù)的方便性；而且設(shè)計(jì)了系統(tǒng)測(cè)試電路，使得儀器具有現(xiàn)場(chǎng)自我診斷檢測(cè)能力，方便了儀器在野外的應(yīng)用。最后，對(duì)樣機(jī)進(jìn)行測(cè)試的結(jié)果證明了本文設(shè)計(jì)完全符合寬頻地震儀的設(shè)計(jì)要求。
關(guān)鍵詞：數(shù)據(jù)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