Logic circuits using polycrystalline semiconductor thin film...

Details Logic circuits using polycrystalline semiconductor thin film... Logic circuits using polycrystalline semiconductor thin film...

2005-10-11

2005-10-11

Tokar, Michael (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

C326S038000, C326S039000, C326S040000, C326S041000, C326S047000

Reexamination Certificate

active

06954084

ABSTRACT:
A large scale integrated (LSI) or a very large scale integrated (VLSI) logic circuit, such as a fully programmable gate array (FPGA), comprises a plurality of polysilicon thin film transistors TFTs. The circuit, which may include a delay circuit, is asynchronous and does not comprise a clock. Thus, operations to be performed by the TFTs need not be performed within a single clock period—rather the operation of each stage of TFTs in the circuit is dependent on receiving a signal either from an input to the circuit or from a preceding stage in the circuit. Problems with variations in the threshold voltage between the TFTs are therefore avoided.

REFERENCES:
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patent: 6590424 (2003-07-01), Singh et al.
patent: 6707317 (2004-03-01), Ebergen et al.
Payne, “Asynchronous FPGA architectures”, IEE Proc.-Comput Digit Tech. vol. 143, No.5., pp. 282-286, 1996.

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