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Showing Results For: Analog Front End (AFE)
An Analog Front End (AFE), which is abbreviated as AFE, or analog front-end controller, and abbreviated AFEC, is a package of analog signal conditioning circuitry that uses fragile analog amplifiers. To offer a reconfigurable and flexible electronics functional block required to interface a range of sensors to an antenna, an analog-to-digital converter, or, in some situations, to a microcontroller, operational amplifiers, filters, and occasionally application-specific integrated circuits are used.
The input clamp is followed by a sampling function. A correlated double sampler is used by AFEs and was created for use with charge-coupled devices. The CDC samples each pixel twice, once at the video level and once at the reset level, and a differential measurement is made between the two.
In commercial infrared imaging applications, contact image sensors and focal-plane arrays often produce a single-ended, ground-referenced signal and don't need a differential measurement. AFEs made for these sensors substitute a sample-hold amplifier for the CDS. The CDS or SHA includes a coarse black-level offset-correction stage.
Even faster speeds are needed for applications like high-speed analysis and security. A 36 MHz AFE can process a 360-pixel CCD at 100 frames per second. High-resolution CCDs (one megapixel or larger) are necessary for multi-function digital cameras and camcorders, such as camcorders with still-shot capabilities and digital still cameras with video capabilities, in order to integrate the still-shot capability with the high-speed video capability. Some of the most commonly used applications are as follows:
Historically, 10-bit intensity-signal resolution has been needed for consumer-grade camcorders and digital cameras. A higher due to processing technology to ensure minimal image integrity loss and additional image editing and manipulation.
Since AFE noise directly impacts the imaging system's dynamic range, it must be kept to a minimum. A system's dynamic range is assessed by contrasting the highest signal that can be processed with the lowest signal that can be resolved.
It is not necessarily possible for a CCD pixel to discern between different hues. Color filters are separately applied to each pixel of a CCD array in a mosaic pattern to divide incoming light into a range of colors.
