Patent ID: 6304148
Filing Date: 2001-10-16
Classification: G11C,H03K

Abstract:
An oscillator having;a ring oscillator wherein an odd number of signal inverting means are connected in series and a current supply means for the purpose of supplying current to the signal inverting means, anda reference current generating circuit that generates a reference current having positive temperature characteristics that becomes the reference for the current which the current supply circuit supplies, wherein the reference current generating circuit comprises an active transistor device to provide the positive temperature characteristic,wherein the signal inverting means is constructed of CMOS inverters, the current supply means contains pMOS transistors and nMOS transistors that are connected between the power supply terminal and the ground terminal, the reference current generating circuit contains a diode-connected first MOS transistor, a plurality of positive temperature coefficient pMOS transisitors and a diode-connected second MOS transistor that are connected between the power supply terminal and the ground terminal.