| IP개요 |
This IP presents an optoelectronic readout integrated circuit (ORIC) fabricated in 180-nm CMOS technology, tailored for high-resolution, short-range LiDAR sensing applications. The ORIC pixel integrates an on-chip P+/Nwell/Deep N-well avalanche photodiode and a CMOS transimpedance-limiting amplifier employing active feedback for low-noise performance. Then, a time-to-voltage (T2V) conversion scheme is adopted to enable precise signal quantization with minimal walk error, which is followed by a voltage-domain successive approximation register (SAR) analog-to-digital converter (ADC). This architecture is suggested to replace conventional time-to-digital converters (TDCs), thereby significantly reducing system complexity while maintaining wide dynamic range and high scalability. This system indicates an input dynamic range of 47.4 dB that corresponds to the detectable photocurrent levels ranging from 15 µApp to 3.5 mApp. This can be translated to a measurable distance of 31 centi-meters to 4.76 meters under typical operating conditions. The TDC with a T2V-SAR ADC pipeline offers a compact, low-power, and scalable solution for emerging applications such as ambient-assisted living and elderly monitoring systems. |
