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Analog accumulator applied to tdi type cmos image sensor

An image sensor and accumulator technology, applied in image communication, color TV components, TV system components, etc., can solve the problems of reducing the integration effect and accumulation effect, and achieve simple structure and increase the effective accumulation series Effect

Active Publication Date: 2017-09-29
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

For the impact of parasitic, it can be intuitively understood that during each integration, the parasitic capacitance is mounted on the input and output terminals of the op amp, forming negative feedback, reducing the integration effect, thereby reducing the accumulation effect, and inhibiting the effective accumulation series. promote

Method used

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  • Analog accumulator applied to tdi type cmos image sensor
  • Analog accumulator applied to tdi type cmos image sensor
  • Analog accumulator applied to tdi type cmos image sensor

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Embodiment Construction

[0013] The invention improves the analog accumulator used in the TDI CIS, and realizes the compensation for the influence caused by the parasitic by adding a positive feedback capacitor. It can greatly increase the number of effective accumulation stages of the accumulator without excessively increasing the area and power consumption of the circuit.

[0014] figure 1 The structural diagram of the analog accumulator proposed by the present invention includes an operational amplifier, an N+1-level integrator, a sampling switch, an integrating switch and a positive feedback capacitor, and N-level pixel signal accumulation can be realized through time oversampling technology. The operational amplifier is implemented with a fully differential structure, and the sampling capacitor is connected to the input terminal of the sampling switch clk1, the integrating switch clk2 and the operational amplifier, and clk1 is connected to the pixel signal or bias voltage at the same time. Anoth...

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Abstract

The invention relates to the field of integrated circuit design. In order to realize the compensation for the influence brought by parasitic, the effective accumulating series number of the accumulator is greatly increased, and at the same time, the area and power consumption of the circuit are not increased too much. For this reason, the technical scheme that the present invention takes is, is applied to the analog accumulator of TDI type CMOS image sensor, comprises operational amplifier, N+1 class integrator, sampling switch, integral switch, also comprises two positive feedback capacitors, a positive A feedback capacitor is connected between the positive input terminal and the positive output terminal of the operational amplifier, and another positive feedback capacitor is connected between the negative input terminal and the negative output terminal of the operational amplifier. The invention is mainly applied to integrated circuit design.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a device and method for compensating the parasitic implementation of an analog accumulator in a CMOS type TDI image sensor. Specifically, it relates to an analog accumulator applied to a TDI-type CMOS image sensor technical background [0002] Time delay integration (TDI) image sensor is a special kind of single row image sensor. Compared with ordinary single-line image sensors, TDI image sensors accumulate N times of pixel signals through multiple acquisitions of the same object. Since the signal increases by N times during the accumulation process, the noise increases during the accumulation process. times, so the output image signal-to-noise ratio (SNR) is improved times. Therefore, the TDI image sensor can obtain low-noise output images at high moving speeds and low light intensity. [0003] Early TDI image sensors were mainly realized by CCD image sensors, beca...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/3745H04N5/353
Inventor 徐江涛黄福军聂凯明高志远史再峰高静姚素英
Owner TIANJIN UNIV
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