Signal conversion device and corresponding method, sensing device
A signal conversion device and signal technology, applied in the field of image sensors, can solve problems such as process fluctuation deviation and large pixel area constraints
Active Publication Date: 2020-11-24
PEKING UNIV
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Problems solved by technology
Of course, the disadvantage of pixel-level analog-to-digital conversion is that it is constrained by the pixel area.
In order to improve the dynamic range, the current pixel analog-to-digital conversion usually adopts a two-step structure of coarse quantization and fine quantization, but the matching between coarse quantization and fine quantization will produce large deviations due to process fluctuations
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[0024] In the following detailed description of the preferred embodiments, reference will be made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the application can be practiced. The exemplary embodiments are not intended to be exhaustive of all embodiments in accordance with the present application. It is to be understood that other embodiments may be utilized and structural or logical modifications may be made without departing from the scope of the present application. Therefore, the following detailed description is not intended to be limiting, and the scope of the application is defined by the appended claims.
[0025] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. The lines between the units in the dr...
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The present application discloses a signal conversion device, comprising a first integration module configured to generate a first integration signal based on a sensing signal of an external sensing element; a second integration module configured to generate a second integration signal; a control module configured to is: in the first quantization stage, based on the first comparison result of the first integrated signal and the reference signal, the first quantized signal and the residual quantity with the first quantization precision are obtained; in the second quantization stage, based on the residual quantity and A second comparison result of the second integrated signal obtains a second quantized signal corresponding to the residual amount and having a second quantization precision, wherein the product of the second quantized signal and the second quantization precision is less than or equal to The first quantization precision. The present application also provides a sensing device including such a signal conversion device and a corresponding signal conversion method.
Description
technical field [0001] The present application relates to the technical field of image sensors, and in particular, to a step-by-step quantization type pixel-level analog-to-digital conversion circuit. Background technique [0002] At present, image sensors are widely used in many fields. The pixel circuit is the key circuit composition of the image sensor. The pixel circuit consists of two parts: one is the detector part, which is used to convert the incident light signal into electron-hole pairs; the other is the readout circuit part, which is used to convert the electron holes. pair into a readable signal. In the traditional APS (Active PixelSensor), because the sensor will discharge the charge on the integrating capacitor, the readable signal is generally an analog voltage drop, and the analog-to-digital conversion is performed off-chip. Due to the requirements for reliability and performance, the pixel circuit structure has also been innovated, and the analog-to-digita...
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IPC IPC(8): H04N5/369
CPCH04N25/70
Inventor 黄首东鲁文高于善哲牛育泽黄兆丰张雅聪陈中建
Owner PEKING UNIV