Patent ID: 6154100
Filing Date: 2000-11-28
Classification: H03K

Abstract:
A ring oscillator made up of a plurality of inverters, each being implemented by a first p-channel MOSFET and a first n-channel MOSFET, which are connected to each other forming a ring like configuration, in each one of said inverters, a second p-channel MOSFET which serving as a constant current load of said first p-channel MOSFET is provided between a voltage source and a source of said first p-channel MOSFET, while a second n-channel MOSFET which serving as a constant current load of said first n-channel MOSFET is provided between a source of said first n-channel MOSFET and ground, wherein said first n-channel MOSFET is a low-threshold-voltage type MOSFET, and a level of a threshold voltage of said first n-channel MOSFET is set at a level lower than that of said second n-channel MOSFET.