Patent ID: 7382165

Claim:
A method, comprising: providing a selection circuit on a semiconductor device, said selection circuit comprising, a logic circuit, an array of sub-circuits comprising a first group of sub-circuits and a second group of sub-circuits, a first switching circuit, and a second switching circuit, wherein an output of said logic circuit is electrically connected to an input of each sub-circuit of said first group of sub-circuits, wherein an output of each sub-circuit of said first group is electrically connected to an input of said first switching circuit, wherein an output of said first switching circuit is electrically connected to an input of each sub-circuit of said second group of sub-circuits, wherein an output of each sub-circuit of said second group is electrically connected to an input of said second switching circuit, and wherein an output of said second switching circuit is electrically connected to an input of said logic circuit; receiving, by said logic circuit, a control signal for enabling said selection circuit; subjecting said selection circuit to a first operating condition; selecting, by said first switching circuit, a first sub-circuit from said first group in response to a first select signal applied to said first switching circuit; selecting, by said second switching circuit, a second sub-circuit from said second group in response to a second select signal applied to said second switching circuit; generating, by said selection circuit, a first frequency; subjecting said selection circuit to a second operating condition, said second operating condition differing from said first operating condition; generating, by said selection circuit, a second frequency; and comparing a first frequency differential between said first frequency and said second frequency to a predetermined frequency differential to determine if said first frequency differential is about equal to said predetermined frequency differential.