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Ramp signal generating circuit and image sensor

A ramp signal and generating circuit technology, applied in the electronic field, can solve the problem of long signal establishment time and achieve the effect of reducing the establishment time and high precision requirements

Active Publication Date: 2015-02-04
GALAXYCORE SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem solved by the present invention is that when the existing slope signal generator is used for high speed and heavy load, there is a problem that the signal establishment time is too long

Method used

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  • Ramp signal generating circuit and image sensor
  • Ramp signal generating circuit and image sensor
  • Ramp signal generating circuit and image sensor

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Embodiment Construction

[0032] In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] like figure 1 As shown, an embodiment of the present invention provides a ramp signal generating circuit, including: an operational amplifier Opamp, a first capacitor C1 and a first switched capacitor group 1 .

[0034] combine figure 2 As shown, the first switched capacitor group 1 includes at least one first switched capacitor unit. The first switched capacitor unit includes: a first switch, a second switch, a third switch, a fourth switch and a second capacitor C2. The first terminal of the first switch is connected to the negative-phase input terminal of the operational amplifier Opamp and the output terminal bufout, and the first terminal of the second switch is connected to the non-phase input terminal of the operatio...

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Abstract

The invention discloses a ramp signal generating circuit and an image sensor, the ramp signal generating circuit comprises an operational amplifier, a first capacitor and at least one first switch capacitance unit, the first switch capacitance unit comprises a first switch, a second switch, a third switch, a fourth switch and a second capacitor; the first end of the first switch is connected to the negative phase input end and the output end of the operational amplifier, the first end of the second switch is connected to the positive phase input end of the operational amplifier and the first end of the first capacitor, the second end of the third switch is applied to input the first voltage, the second end of the fourth switch is applied to input the second voltage, which is unequal to the first voltage on voltage value; in the same first switch capacitance unit, the second end of the first switch is connected to the second end of the second switch and the first end of the second capacitor, the first end of the third switch is connected to the first end of the fourth switch and the second end of the second capacitor; the second end of the first capacitor is connected to the ground; the capacitance value of the first capacitor is greater than that of the second capacitor.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a ramp signal generating circuit and an image sensor. Background technique [0002] In the image sensor, with the continuous expansion of the pixel unit array scale, the traditional chip-level analog-to-digital converter can no longer meet the requirements of high frame rate, so the high-frame rate image sensor adopts column-level analog-to-digital converter, in which the single slope The single slope analog to digital converter (SS ADC) has the characteristics of achieving high precision with only a small area and power consumption, and is widely used in image sensors with high pixel and high frame rate. In the SS ADC, a ramp signal is needed as the comparison level of the comparator, and its accuracy directly affects the output accuracy of the SS ADC, so how to generate a high-precision ramp signal is a very important research topic. [0003] One way to generate a traditional ramp s...

Claims

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Application Information

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IPC IPC(8): H03K4/08H04N5/369
Inventor 赵立新乔劲轩李敏兰
Owner GALAXYCORE SHANGHAI
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