Preliminary Experiment for Precise and Dynamic Digital Calibration for Two-Stage Cyclic ADC Suitable for 33-Mpixel 120-fps 8K Super Hi-Vision CMOS Image Sensor
نویسندگان
چکیده
An ADC operation and signal processing scheme in the error measurement mode has been developed to determine error coefficients. A preliminary experiment was performed by using an ADC test circuit to verify the scheme’s effectiveness for precise and dynamic digital calibration. The calibration process was performed by using the evaluated values of error coefficients in the proposed way, and the results demonstrated that the nonlinearity of the ADC was successfully improved by compensating for errors caused in the ADC due to capacitor mismatch, finite gain and incomplete settling of the amplifier, and offset. The DNL and INL were improved to +0.49/−0.72 LSB from +0.39/−1 LSB and +4.7/−1.4 LSB from +5.8/−2.9 LSB, respectively. These results show that the proposed method is promising for achieving precise and dynamic digital calibration. Keywords—Digital calibration, Cyclic ADC, Super Hi-Vision, 33-Mpixel, 120-fps, CMOS image sensor
منابع مشابه
Digital Calibration Algorithm for 2-Stage Cyclic ADC used in 33-Mpixel 120-fps CMOS Image Sensor
This paper proposes a digital calibration algorithm for a 2-stage cyclic analog-to-digital converter (ADC) with 12-bit resolution used in a 33-Mpixel 120-fps CMOS image sensor. A simulation was performed to verify the algorithm with the large values of errors that we set. Results showed that the maximum differential nonlinearity (DNL) was improved to 0.49 LSB from 4.5 LSB, and that the integral...
متن کاملBroadcast Technology
Full-specification 8K Super Hi-Vision Production System We presented a new video production system for full-specification 8K Super Hi-Vision (120-Hz frame frequency, 12-bit bit depth, and wide-color-gamut colorimetry). Compact 120-fps 8K Super Hi-Vision Camera Various cameras are being developed with the goal of constructing a 120-fps 8K Super Hi-Vision video production system. This exhibition ...
متن کاملA Two-Step A/D Conversion and Column Self-Calibration Technique for Low Noise CMOS Image Sensors
In this paper, a 120 frames per second (fps) low noise CMOS Image Sensor (CIS) based on a Two-Step Single Slope ADC (TS SS ADC) and column self-calibration technique is proposed. The TS SS ADC is suitable for high speed video systems because its conversion speed is much faster (by more than 10 times) than that of the Single Slope ADC (SS ADC). However, there exist some mismatching errors betwee...
متن کاملSegmented-base CMOS Image Sensor for Machine Vision Application
In this paper, a CMOS image sensor whose focal plane is divided into several segments for machine vision application and an effective imaging method using segmented-base CMOS image sensor are presented. The proposed architecture of the image sensor adjusts imaging parameters on a segmented base. A segment is coupled to an external processing engine, which enables faster readout and real-time pr...
متن کاملA 12-Bit High-Speed Column-Parallel Two-Step Single-Slope Analog-to-Digital Converter (ADC) for CMOS Image Sensors
A 12-bit high-speed column-parallel two-step single-slope (SS) analog-to-digital converter (ADC) for CMOS image sensors is proposed. The proposed ADC employs a single ramp voltage and multiple reference voltages, and the conversion is divided into coarse phase and fine phase to improve the conversion rate. An error calibration scheme is proposed to correct errors caused by offsets among the ref...
متن کامل