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Ultraviolet focal plane readout circuit and method based on pixel level analog-to-digital conversion

An analog-to-digital conversion and read-out circuit technology, which is used in TV, electrical components, color TV, etc., can solve the problems of large noise impact, long analog signal transmission path, and high rate requirements, and achieves improved frame rate and signal processing speed. , the effect of large output dynamic range

Inactive Publication Date: 2014-06-11
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The problems of this readout method are: the transmission path of the analog signal is long, and the influence of noise is large; the imaging of a large area array with a high frame rate still requires a high rate of the analog-to-digital converter

Method used

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  • Ultraviolet focal plane readout circuit and method based on pixel level analog-to-digital conversion
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  • Ultraviolet focal plane readout circuit and method based on pixel level analog-to-digital conversion

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Embodiment Construction

[0032] The ultraviolet focal plane readout circuit and its readout method based on pixel-level analog-to-digital conversion of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0033] The ultraviolet focal plane readout circuit based on pixel-level analog-to-digital conversion of the present invention, its overall block diagram is as follows figure 1 shown. Designed with DP4M standard CMOS process, the pixel unit size is 50 microns × 50 microns.

[0034] figure 2 It is a schematic diagram of the unit circuit and system structure. Each unit circuit is composed of a front-end charge integration module and an analog-to-digital conversion module. The front-end charge integration module includes a reset transistor, an integral capacitor, an operational amplifier A1, a transmission gate, and a sampling capacitor. The reset transistor and the integral capacitor are connected in parallel, and connected across...

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Abstract

The invention discloses an ultraviolet focal plane readout circuit and method based on pixel level analog-to-digital conversion. The ultraviolet focal plane readout circuit comprises a front end electric charge integrator, a pixel level analog-to-digital conversion module, a row / column selecting control circuit, an induction amplifier and an output level buffering device, wherein the front end electric charge integrator is used for integrating a weak photo-generated current of an ultraviolet detector so as to convert the current into a voltage; the pixel level analog-to-digital conversion module can quantitatively simulate the voltage in a pixel, and a quantitative result can be latched; each unit on a focal plane can be selected by the row / column selecting control circuit; the induction amplifier inducts and amplifies the quantitative result in the pixel and sends the amplified quantitative result into an output bus; the output level buffering device is used for increasing output driving capacity of a circuit, and output signals are sequentially output in a serial mode. According to the readout circuit, signals of the ultraviolet detector are directly converted into digital signals, interference of noise to the signals is reduced by reducing a simulation signal transmission path, on-chip analog-to-digital conversion is achieved, the signal to noise ratio of an ultraviolet focal plane chip is effectively improved, and the readout circuit can be applied to detection and imaging of the weak ultraviolet signals.

Description

technical field [0001] The invention relates to a signal processing technology of an ultraviolet focal plane readout circuit, in particular to an ultraviolet focal plane readout circuit and a readout method based on a pixel-level analog-to-digital conversion structure. Background technique [0002] Due to its unique characteristics of "solar blindness" and "visible blindness", ultraviolet detection technology has broad application prospects in civil and military fields. The ultraviolet focal plane array is the core part of ultraviolet detection technology, mainly composed of ultraviolet detector array and readout circuit. The readout circuit integrates and amplifies the weak signal output by the ultraviolet detector, and outputs it to the analog-to-digital converter through the multiplexer for digital conversion of the analog signal. The performance of the readout circuit will directly affect the quality of the UV focal plane. With the continuous improvement of UV focal pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/378H04N5/357H04N5/374
Inventor 徐斌袁永刚李向阳马丁叶柏松
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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