Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Reexamination Certificate
2004-12-23
2009-12-22
Chang, Daniel D (Department: 2819)
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
C326S121000, C327S276000
Reexamination Certificate
active
07635992
ABSTRACT:
A tapered chain of delay elements. The chain of delay elements includes a plurality of delay elements comprising a plurality of smaller sized stacked inverter delay elements each configured to implement a first delay, and a plurality of larger sized stacked inverter delay elements each configured to implement a second delay larger than the first delay. A switch circuit is coupled to the plurality of delay elements and is configured to select at least one of the plurality of delay elements to create a delay signal path having an amount of delay in accordance with a number of delay elements comprising the delay signal path. An input is coupled to a first delay element of the delay signal path to receive an input signal. An output is coupled to the switch circuit, wherein the output is coupled to the delay signal path to receive a delayed version of the input signal after propagating through the delay signal path.
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