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What are the differences CMOS and CCD sensors?


In digital photography, the lens onto the sensor by the incident light from the pixels of the sensor, called pixels (picture elements), registered as electrical charges. These charges are read, amplified and finally converted in the analog-digital conversion in the image information. A charge so eventually a digital numerical value that can be stored on a memory card or a hard disk or sent via a data line. In principle, this process runs in both sensor technology from the same. CMOS image sensors and CCD image sensors, however, differ in their Architecture and therefore follow in the implementation of light in its own image data "workflow."

CMOS? CCD? What does that mean anyway? The technical terms for the two sensor types - at least to the layman - not deduce what distinguishes them in terms of their photographic qualities: CMOS stands for Complementary Metal Oxide Semiconductor, CCD stands for Charged Coupled Device. The catchy acronym

say that is just generally something about the design or the manufacturing process and not on the intended use. Both belong to the family of semiconductor devices, both are capable of the incident on the sensor put light into a usable image information. The main difference is in how this happens. must be converted

of CCD sensors first all electric charges are read and only then can amplified, that is, into an electrical signal. In contrast, each pixel has the CMOS sensor, a separate amplifier for the electric charges. The amplification is done separately for each pixel. This allows a CMOS sensor can be read much faster. CMOS sensors will need a lower voltage and less power than a CCD sensor. This reduces the power consumption of a digital camera, which consequently longer operational. Furthermore, additional circuits on the CMOS sensor to be integrated, to be "outsourced to a CCD sensor." Another advantage: Large-scale CMOS sensors can be produced at lower cost than CCD - digital photography at the highest level is so affordable to a larger number of photographers.

Innovative technologies on the sensor


The advantages of CMOS technology were initially some disadvantages with respect to noise and minor variations among the pixels of a sensor to. To solve the problem, Canon has a number of technical innovations introduced.

first To eliminate fluctuations and noise, the CMOS sensors have a special integrated circuit. It allows the video signal is read at a high signal-to-noise ratio, resulting in better image quality.

second In order to minimize the molecular activities attributable to random noise, Canon's CMOS sensors work with the full-charge-transfer system that allows the complete transport of all charges of a pixel.

The new EOS-1Ds take the efforts of the Canon engineers are an essential part of the unique capabilities of the camera. The ultra-large, single-plate 11.1-megapixel CMOS sensor combines high speed and high sensitivity of ISO 100-1250 (ISO 50 via Custom Function) with low power consumption. RGB primary color filters provide in conjunction with a highly efficient image data processing for a precise and vivid color reproduction. Through a special simultaneous two-channel readout of the pixels could be the speed of reading can be doubled.

CMOS technology, in conjunction with the professional philosophy of the EOS-1 series are the foundation for exceptional performance and image quality of the EOS-1Ds.

whether CMOS or CCD - is one of the photographers at the end of the technology that helps him his job, fantastic photos, make.

The unique new Canon CMOS sensor in the small-screen full-size increases the processing speed by parallel readout of the pixels. The graph shows the difference in the times easier (right side) and parallel readout (left side).

Luis Fernando Cantor Bueno
19135529
Ingenieria Electronica Electronica De Estados sólidos
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