高速匀速式模拟线发生器
A High Speed Analog Vector Generator Based on Constant Velocity
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摘要: 本文介绍的高速匀速模拟线发生器,采用匀速模拟画线原理,用一个积分器产生公用的 电压斜率波,由两个数模转换乘法器MDAC产生严格成比例的X,Y轴模拟讯号,在保证画 线精度的条件下获得了高速度.采用此线发生器的GTX-A型高速光笔图形显示器的性能为 40 n.s/r.u,精度接近0.1%.Abstract: he vector generator is the key unit for determining the drawing speed, precision and performance of a random scanning graphic graphic display device. In this paper, a high speed analog vector generator is described. In this scheme, a well designed integrator with MOS-FET electronic switches is used to generate the ramp voltage-time waveform which is shared by two multiplier D/A converters (MDAC). The strictly proportional X axis and Y axis defleeting signals with both high speed and precision are derived from these two MDAC. A graphic display device GTX-A equipped with this vector generator has performances as follows: 120m/30ms and nearly 0.1% precision.
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