Analog buffers composed of thin film transistors

Details Analog buffers composed of thin film transistors Analog buffers composed of thin film transistors

2007-05-22

2007-05-22

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C345S204000

Reexamination Certificate

active

11061836

ABSTRACT:
Analog buffers with a precise gate to source voltage compensation and a small DC offset, by storing an input offset voltage to be used as an output offset voltage to reverse the offset in the input. A first source follower at the input end and a second source follower at the output end are both coupled to a switching circuit, wherein the first follower provides an input offset voltage (e.g., |Vgsp|) based on the input voltage (Vin), the second source follower provides an output voltage (Vout) by compensating Vin transmitted through the analog buffer circuit with an output offset voltage (|Vgsn|), and the switching circuit stores and equalizes the output offset voltage to the input offset voltage (|Vgsp|=|Vgsn|), so to obtain an output Vout that is identical to Vin.

REFERENCES:
patent: 6556162 (2003-04-01), Brownlow et al.
patent: 6876235 (2005-04-01), Li et al.
patent: 6919743 (2005-07-01), Tobita
patent: 7075342 (2006-07-01), Nishimura
Y. Kida, et al., “LN-4: A 3.8 inch Half-VGA Transflective Color TFT-LCD with Completely Integrated 6-bit RGB Parallel Interface Drivers”, EURODISPLAY 2002, pp. 831-834.

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