Implementation of delta—sigma analog‐to‐digital converter in LTPS process

Abstract

Abstract— An on‐panel delta—sigma analog‐to‐digital converter (ADC) has been implemented and verified for 3‐μm low‐temperature polysilicon (LTPS) technology with two basic blocks: a delta—sigma modulator and a decimation filter. From the experimental results, the digital output from the delta—sigma modulator is correctly matched with the analog input voltage ratio such that the digital output can be converted into 8‐bit digital code successfully under a supply voltage of 10 V from the decimation filter. The implemented on‐panel delta—sigma ADC can be used for the application of temperature‐to‐digital converter on glass substrate.

Thin-Film Transistor-Based Sensor Interface Circuits Enabling Distributed Local In-Module Solar Cell Temperature Monitoring

“…Presently in literature, little research has been conducted on the design of complex digital and analog blocks in LTPS technology. An analog buffer including a two stage OpAmp [22], [23], a class-B buffer with offset compensation [24], an OpAmp and comparator integrated in sigma-delta ADC [25], charge integrating amplifier for sensor array readout [26] and a high performance CMOS OpAmp [27] are notable works that provide insights into the current state-of-the-art in TFT mixed JSSC-23-0077 signal design. Considering the capability of LTPS technology for design of CMOS circuits especially when lower performance and cost of integrated circuits is expected, the gap between the capacity of this technology and actual realizations already published in literature highlights the importance of design and development in thin-film flexible circuits.…”