Output-Compensated Buffers with Source-Follower Input Structure and Image Capture Devices Using Same
a buffer and input structure technology, applied in the field of signal buffers, can solve the problems of reducing the level of the signal produced by the image capture elements in the ccds, unable to achieve high gain from such a circuit, and reducing the ccds
Inactive Publication Date: 2006-10-05
PARK SANG SIK
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Benefits of technology
"The present invention provides buffers with high-gain for use with devices such as CCD image capture devices. These buffers have source follower input circuits and feedback circuits that variably capacitively couple a bias terminal of the input source follower to a power source, in response to the output of the buffer. This feedback circuit is operative to vary the input capacitance of the buffer responsive to the output signal. The technical effect of this invention is to improve the performance of the buffer and ensure better signal quality."
Problems solved by technology
As the size of CCDs has reduced, however, the levels of the signals produced by the image capture elements in CCDs have generally become smaller.
Achieving high gain from such a circuit can be problematic.
Method used
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[0018] The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like numbers refer to like elements throughout. It will be understood that when an element such as a layer, region or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. Moreover, each embodiment described an...
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An output-compensated buffer includes a buffer circuit that receives an input signal and produces an output signal responsive thereto at an output terminal, the buffer circuit including an input source-follower circuit that receives the input signal. A feedback circuit is connected to the output terminal and to the input source follower circuit and operative to vary an input capacitance of the source follower circuit responsive to the output signal at the output terminal. The input source follower circuit preferably includes a bias terminal coupled to a power source, and the feedback circuit is preferably capacitively coupled to the bias terminal. According to another aspect, an image capture device includes a charged coupled device (CCD) that generates a video signal. A buffer circuit is responsive to the CCD and operative to receives the video signal and produce an output signal responsive thereto at an output terminal, the buffer circuit including an input source-follower circuit that receives the video signal. A feedback circuit is connected to the output terminal and to the input source follower circuit and operative to vary an input capacitance of the source follower circuit responsive to the output signal at the output terminal.
Description
CLAIM FOR PRIORITY AND RELATED APPLICATION [0001] This application claims priority to and is a continuation of parent application Ser. No. 09 / 399,995, filed Sep. 20, 1999, the disclosure of which is hereby incorporated herein by reference, and is related to Korean Patent Application No. 1998-39101, filed on Sep. 21, 1998, the contents of which is also herein incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to microelectronic devices, and more particularly, to signal buffers suitable for use in devices such as charged-coupled device (CCD) image capture systems. BACKGROUND OF THE INVENTION [0003] Charge coupled devices (CCDs) are image capture devices that generally offer superior characteristics such as small size, light weight and low power consumption in comparison to other conventional image capture devices. Accordingly, CCDs are commonly used in broadcasting or domestic video cameras, monitoring cameras, and digital still camer...
Claims
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IPC IPC(8): H04N5/335H04N5/14H01L27/148H03F3/50H04N25/00
CPCG11C19/285H03F1/342H04N5/335H04N3/155H03F3/505H04N25/75H04N25/78H04N25/709
InventorPARK, SANG-SIK
OwnerPARK SANG SIK