CCD (Charge Coupled Device) image sensor is a kind of photoelectric converter widely used in digital cameras, video cameras and other image devices. The circuit composition and characteristics are as follows:
1. Circuit composition:
-Photoelectric conversion unit: it is responsible for converting incident light into charge, and transmitting in the charge storage optical grating;
-Transmission unit: including vertical transmission register and CD74HCT125E Horizontal transfer register for transferring, amplifying and reading charges;
-Control unit: control the working mode, exposure time, reset and other parameters of the sensor;
-Output unit: converts the converted charge signal into voltage signal for subsequent processing.
2. Characteristics:
-High sensitivity: CCD sensor has high response sensitivity to light and can capture weak light signals.
-Low noise: because there is no amplifier and other components in the charge transmission process, the noise level is low.
-Wide dynamic range: CCD sensor can handle large light intensity difference and has a wide dynamic range.
-High resolution: CCD sensor can provide high image resolution and excellent detail expression.
-Low energy consumption: Compared with CMOS sensors, the power consumption of CCD sensors is relatively low under the same conditions.
-Good exposure uniformity: CCD sensor can provide a more uniform exposure effect when facing uniform light.
In general, CCD image sensors are widely used in fields requiring high-quality image performance, such as photography, medical imaging, astronomical observation, etc., through their excellent sensitivity, low noise, high resolution and other characteristics.
