A high-sensitivity CCD image sensor using source follower circuit with actively controlled gain characteristics

Doping Effect of Ethylcarbazole-Contained-Silole in Blue-Sensitive Organic Photoconductive Device

“…Charge coupled device (CCD) and complementary metal oxide semiconductor (CMOS) image sensors have been used for photo-sensitive applications, such as consumer cameras, broadcasting video cameras, and digital still cameras [1][2][3][4][5]. Nowadays, two types of image sensors have been used as the practical device.…”

Channel Length Influence on the Performance of Source-Follower Buffers Implemented with Graded-Channel SOI nMOSFETs

“…Analog buffers are important building blocks (1), used in a large number of applications of great importance for many analog systems (2,3). For most applications, such as in the case of integrated active pixel sensor (APS) cells in CMOS imagers (2,4), a stage with unity gain is required to provide buffering between two nodes.…”

“…It consists of a transistor in common-drain configuration and biased by a current source, with input at the gate (V IN ) and output at the source terminal (V OUT ), as represented in Figure 1(A). Despite its simplicity, a source-follower buffer presents good performance, featuring high input impedance and low output impedance (1), which is the reason for its use in a large number of applications (3,4,5). However, in practice, the gain of a source-follower buffer is always smaller than unity and its output characteristics present nonlinear behavior because it suffers from body-effect and channel length modulation (1).…”