A high speed column-parallel CDS/ADC circuit with nonlinearity compensation is proposed in this paper.The correlated double sampling (CDS) and analog-to-digital converter (ADC) functions are integrated in a threephase...A high speed column-parallel CDS/ADC circuit with nonlinearity compensation is proposed in this paper.The correlated double sampling (CDS) and analog-to-digital converter (ADC) functions are integrated in a threephase column-parallel circuit based on two floating gate inverters and switched-capacitor network.The conversion rate of traditional single-slope ADC is speeded up by dividing quantization to coarse step and fine step.A storage capacitor is used to store the result of coarse step and locate the section of ramp signal of fine step,which can reduce the clock step from 2 n to 2 (n/2+1).The floating gate inverters are implemented to reduce the power consumption.Its induced nonlinear offset is cancelled by introducing a compensation module to the input of inverter,which can equalize the coupling path in three phases of the proposed circuit.This circuit is designed and simulated for CMOS image sensor with 640×480 pixel array using Chartered 0.18μm process.Simulation results indicate that the resolution can reach 10-bit and the maximum frame rate can reach 200 frames/s with a main clock of 10MHz.The power consumption of this circuit is less than 36.5μW with a 3.3V power supply.The proposed CDS/ADC circuit is suitable for high resolution and high speed image sensors.展开更多
There seems to be a renewed interest in the last couple decades in studying and writing about consciousness. Consciousness may be the most difficult question humans are trying to resolve. Yet eliciting transcendence, ...There seems to be a renewed interest in the last couple decades in studying and writing about consciousness. Consciousness may be the most difficult question humans are trying to resolve. Yet eliciting transcendence, a phenomenon that rises above, or goes beyond, normal limits of consciousness, has been an identified goal for many artists in the past, possibly even in cave art. Drawing on works shown in the 2006 Art Gallery of Hamilton exposition called Sublime Embrace： Experiencing Consciousness in Contemporary Art and in the 2002 Houston Contemporary Art Museum 2002 show called THE INWARD EYE： Transcendence in Contemporary Art, the author will explore the biological, psychological, cultural, and spiritual facets of transcendence. Perhaps, with the renewed symbiotic relationship between the sciences and art, the convergence of digital media, and the emergence of global communication networks, we are at the verge of art that will create a change, an alteration in our consciousness, and an altercendent state. What this change will be is yet a mystery.展开更多
基金Supported by National Natural Science Foundation of China (No.60806010,No.60976030)
文摘A high speed column-parallel CDS/ADC circuit with nonlinearity compensation is proposed in this paper.The correlated double sampling (CDS) and analog-to-digital converter (ADC) functions are integrated in a threephase column-parallel circuit based on two floating gate inverters and switched-capacitor network.The conversion rate of traditional single-slope ADC is speeded up by dividing quantization to coarse step and fine step.A storage capacitor is used to store the result of coarse step and locate the section of ramp signal of fine step,which can reduce the clock step from 2 n to 2 (n/2+1).The floating gate inverters are implemented to reduce the power consumption.Its induced nonlinear offset is cancelled by introducing a compensation module to the input of inverter,which can equalize the coupling path in three phases of the proposed circuit.This circuit is designed and simulated for CMOS image sensor with 640×480 pixel array using Chartered 0.18μm process.Simulation results indicate that the resolution can reach 10-bit and the maximum frame rate can reach 200 frames/s with a main clock of 10MHz.The power consumption of this circuit is less than 36.5μW with a 3.3V power supply.The proposed CDS/ADC circuit is suitable for high resolution and high speed image sensors.
文摘There seems to be a renewed interest in the last couple decades in studying and writing about consciousness. Consciousness may be the most difficult question humans are trying to resolve. Yet eliciting transcendence, a phenomenon that rises above, or goes beyond, normal limits of consciousness, has been an identified goal for many artists in the past, possibly even in cave art. Drawing on works shown in the 2006 Art Gallery of Hamilton exposition called Sublime Embrace： Experiencing Consciousness in Contemporary Art and in the 2002 Houston Contemporary Art Museum 2002 show called THE INWARD EYE： Transcendence in Contemporary Art, the author will explore the biological, psychological, cultural, and spiritual facets of transcendence. Perhaps, with the renewed symbiotic relationship between the sciences and art, the convergence of digital media, and the emergence of global communication networks, we are at the verge of art that will create a change, an alteration in our consciousness, and an altercendent state. What this change will be is yet a mystery.
