Patent ID: 6583817
Filing Date: 2003-06-24
Classification: H03M,H04N

Abstract:
A signal sensing apparatus comprising:a signal sensing array having N columns of output lines for outputting N analog signals, respectively, N being an integer greater than one; a signal processing means for generating N digital signals each of which corresponds to one of N analog signals, respectively, the signal processing means having N input lines comprising: N A/D converters each including a counter for generating one of the N digital signals, respectively, wherein during an initialization period prior to the N digital signals being produced, a predetermined reference voltage is coupled to inputs of the N A/D converters and a compensation value corresponding to each of the N A/D converters is obtained, wherein the compensation value is a binary complement to the digital signal from a corresponding A/D converter as the reference voltage is applied during the initialization period, so that the counter within each of the N A/D converter is initialized with the compensation value to compensate for the digital output of the corresponding A/D converter, thereby balancing non-uniformity of elements within the signal processing means.