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A programmable gain amplifier circuit for image sensor

An image sensor and programming gain technology, applied in image communication, television, electrical components, etc., can solve the problems of PGA circuit parasitic capacitive coupling signal influence, large chip area, etc., and achieve the effect of eliminating the influence of fixed pattern noise and interference

Active Publication Date: 2022-07-08
合肥海图微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a PGA circuit for an image sensor, to solve the problem that the PGA circuit in the prior art is easily affected by parasitic capacitive coupling signals and requires a large chip area to realize

Method used

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  • A programmable gain amplifier circuit for image sensor
  • A programmable gain amplifier circuit for image sensor
  • A programmable gain amplifier circuit for image sensor

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like image 3 As shown, a PGA circuit for an image sensor includes an OTA. The inverting input terminal of the OTA is connected to the image sensor signal through a sampling capacitor Cs, and a feedback capacitor in parallel is connected between the inverting input terminal and the output terminal of the OTA. Cf and switch Sf also include a plurality of adjustment capacitors C5-C8. One end of each of the plurality of adjustment capacitors C5-C8 is commonly connected to the inverting input terminal of the OTA, and the other end of each adjustment capacitor C5-C8 is connected to a dual signal channel. S5-S8, dual signal channels S5-S8 are respectively composed of two groups of signal channels. The two groups of signal channels corresponding to each adjustment capacitor C5-C8 are selected to be turned on or off under the control of external register...

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PUM

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Abstract

The invention discloses a programmable gain amplifier circuit for an image sensor, comprising an operational transconductance amplifier, an inverting input end of the operational transconductance amplifier is connected to an image sensor signal through a sampling capacitor, and an inverting input end of the operational transconductance amplifier is connected to an image sensor signal through a sampling capacitor. . The output terminals are connected with feedback capacitors, switches, and multiple adjustment capacitors in parallel with each other. The multiple adjustment capacitors are respectively connected with dual signal channels. The dual signal channels are composed of two groups of signal channels. One group of signal channels is commonly connected to the sampling capacitor, and each adjustment capacitor is commonly connected to the output end of the operational transconductance amplifier through the corresponding second group of signal channels. The invention can eliminate the influence of the interference introduced by the parasitic capacitance, and can provide various magnifications as required.

Description

technical field [0001] The invention relates to the field of image sensor gain amplifier circuits, in particular to a programmable gain amplifier circuit for image sensors. Background technique [0002] Image sensors are the core of image acquisition equipment, mainly used in digital cameras and industrial, media, medical, and consumer electronics. With the increasing demand for cameras, video cameras, and multimedia mobile phones, the image sensor market is growing rapidly. At present, solid-state image sensors mainly include CCD and CMOS image sensors. CCD image sensors have been widely used due to their high fill factor and low fixed pattern noise. However, its application is limited due to its shortcomings such as multiple voltages, high power consumption, low speed, and difficulty in integrating with CMOS processes. CMOS technology has gradually become the mainstream technology of image sensors due to its low power consumption, low operating voltage and high integrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/369H04N5/365H04N5/378
CPCH04N25/677H04N25/70H04N25/75
Inventor 郭锐高庆杨鑫波
Owner 合肥海图微电子有限公司
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