WITCHED-CAPACITOR CIRCUITS are usually fabricated using either a metal-gate MOS technology or a modified silicongate technology. The bar code reader IC is a switched-capacitor circuit implemented in a standard silicon-gate digital CMOS.A typical bar code reader consists of an optical reflective sensor and a PC board containing an amplifier and digitizer. A sketch of such a reader is shown in Figure 1. The bar code reader IC contains a photodiode and electronics to replace the printed circuit board. This IC is…
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