时间预测和记录精度的关系研究与设计

THE STUDY AND DESIGN OF THE RELATION BETWEEN THE TIME PREDICTION AND THE RECORD PRECISION

增益比较器是瞬时浮点放大器的核心部件,它在工作时既考虑子样电压的现时值,又考虑其未来预测值,这样做的目的是为了防止出现飞点。本文以DFS—V和SN338仪器为例,对时间预测和记录精度进行了较深入的研究,指出了时间预测对记录精度的不利影响,这种不利影响是由于预测时间过长和子样电压现时值参加比较造成的。本文设计一种单极性比较器,在该比较器中参加比较的子祥电压只是预测值,而且预测时间可以连续地调整到最佳状态,既可以防止出现飞点又能确保记录精度。

The gain comparer is the key part of the instant floatingpoint amplifier. When it isworking, it considers both the current value of the sample and the predicted value, thepurpose of which is to avoid producing flying-spot. Taking the DFS-V and SN338 in-struments as an example, the article deeply studies the predicted time and the recordprecision, pointing out that time predicting has unfavourable effect on the record preci-sion, which is because of too long predicting time and current value of the sample volt-age attending to compare. Designing a kind of monopolarity comparer, in which only thepredicted value of the sample voltage needs to be compared and predicted time can be ad-juted to the best state, it both avoids producing flying-spot and guarantees the recordprecision.