High Speed Digital-To-Analog Tool Controller
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
In a digital controller for an analog system, e.g., an electron beam tool, digital data is typically applied to a digital-to-analog converter, and the resulting analog voltage is amplified and applied to the tool. An enable signal is provided to enable the tool once all the components in the controller have settled. Disclosed herein is a multi-channel tool controller which eliminates the above-described settling time delay to thereby speed up tool operation. Referring to the figure, the controller operates with a minimum of two channels of registers 1, 2, digital-to-analog converters 3, 4 and amplifiers 5, 6. A high speed electronic switch 8 selects either channel A or B. A suitable timing circuit 7 assures that the proper sequence of clock pulses and channel selection is maintained, and also controls the tool enable time.