Patent ID: 6998901
Filing Date: 2006-02-14
Classification: G11C,H03K

Abstract:
1. A self refresh oscillator, comprising: a plurality of inverters serially connected between an input terminal and an output terminal; a pull up driver for charging a first node in accordance with a level of the output terminal, which is connected to the first node; a comparator for comparing a potential of the first node with a reference voltage and outputting the result to the input terminal; and a period adjusting unit for discharging a current from the first node to a round according to a level of the output terminal, wherein the period adjusting unit includes at least one first transistor and a second transistor serially connected between the ground and the first node, and the at least one first transistor being connected as a diode shape, and the second transistor being turned on in accordance with the level of the output terminal.