Charged particle beam multiple-pole deflection control circuitry

摘要

Circuitry that controls a multiple-plate charged particle beam deflection arrangement includes a Digital Signal Processor (DSP) acting through a separate accumulating Arithmetic Logic Unit (ALU) connected to each of the plates. For each line to be scanned, at the commencement of the scanning of the line, the DSP delivers to each accumulating ALU a separate signal composed of a digital number representing an initial value (if any) and a digital number representing a step size. During each subsequent cycle of a clock, each accumulating ALU successively adds the step size to a resulting cumulative sum. This cumulative sum depends upon the initial value (if any) plus the step size multiplied by the number of cycles that have elapsed since the initial cycle.