Patent ID: 6177831
Filing Date: 2001-01-23
Classification: G05F,G11C,H03L

Abstract:
A semiconductor integrated circuit comprising:at least one circuit performing a given function and including at least one transistor having a well; anda potential control circuit receiving an input signal from outside said potential control circuit and said at least one circuit, said potential control circuit varying the potential of said well of said at least one transistor to any of a multiplicity of potentials within a range of potentials between a saturation value and zero of said at least one transistor of said at least one circuit,wherein said potential of said well is controlled to be a potential within said range of potentials corresponding to an existing value of said input signal, wherein a line representing said correspondence between said potential of said well and said existing value of said input signal is a continuous line,wherein said input signal from outside said potential control circuit and said at least one circuit adjusts an operating speed of said at least one transistor to be one of any of a multiplicity of different speeds; andwherein the existing value of said input signal is related to a frequency, and the potential control circuit controls the well potential in accordance with the frequency.