P-51: Design and Realization of Delta-Sigma Analog-To-Digital Converter in LTPS Technology

A delta‐Sigma analog‐to‐digital (A/D) converter designed and implemented with the thin‐film transistors (TFTs) on glass substrate is proposed, which has been successfully verified in a 3‐μm low‐temperature polycrystalline silicon (LTPS) process. The experimental results have shown that the probability in the bit stream of the digital output from the delta‐Sigma modulator is correctly fit in the analog input voltage ratio. Such a bit stream can be converted into 8‐bit digital code successfully under the operation voltage of 10V with thin‐film transistors (TFTs) on the glass substrate. The proposed delta‐Sigma A/D converter can be further used to achieve the precise analog circuits for System‐on‐Panel (SOP) or System‐on‐Glass (SOG) applications, which enables the analog circuits to be integrated in the active matrix LCD (AMLCD) panels.