Patent ID: 6232904
Filing Date: 2001-05-15
Classification: H03K,H04N

Abstract:
A scanning system for providing a linear output to a deflection circuit comprising:a coarse digital-to-analog converter having a digital input and an analog output;a fine digital-to-analog converter having a digital input and an analog output;a delta digital-to-analog converter having a digital input and an analog output;a first summing circuit having a first input connected to the analog output from the coarse digital-to-analog converter, having a second input connected to the analog output from the fine digital-to-analog converter, and having a third input connected to the analog output from the delta digital-to-analog converter;a reference digital-to-analog converter having a digital input and an analog output;a difference amplifier having a first and second input and an analog output, wherein the reference digital-to-analog converter analog output is connected to the first input, and the output from the first summing circuit is connected to the second input;an analog-to-digital converter having an analog input and a digital output, said analog-to-digital converter analog input is connected to the output of the difference amplifier;a memory; anda processor and a digital bus connected to said memory, to the digital output of the analog-to-digital converter, and to the digital inputs of the coarse, fine, delta, and the reference digital-to-analog converters.