Patent ID: 6380764
Filing Date: 2002-04-30
Classification: G06F,H03K

Abstract:
A semiconductor integrated circuit device having logic gates constructed of switching elements formed on a semiconductor substrate, which performs given processing by the logic gates on at least one input signal and outputs at least one signal, the switching elements being composed of at least one signal, the switching elements being composed of at least two kinds of switching elements, wherein at least one of a process condition and a bias voltage applied to the substrate or a well of the switching elements is different between a first kind of the switching elements each with a first threshold voltage and a second kind of the switching elements each with a second threshold voltage, such that each of the first kind of the switching elements has lower threshold voltage than each of the second kind of the switching elements, wherein there are provided signal paths composed of a signal path from a first node to a second node, a signal path from the second node to a third node and a signal path from the second node to a fourth node, wherein a ratio of the number of logic gates constructed of switching elements each with the first threshold value to the total number of logic gates on the path from the first node to the second node, is larger than a ratio of the number of logic gates constructed of switching elements each with the first threshold value to the total number of logic gates on the path from the second node to the third node, or the path from the second to the fourth node.