Timer circuit and semiconductor memory incorporating the...

Details Timer circuit and semiconductor memory incorporating the... Timer circuit and semiconductor memory incorporating the...

2005-02-15

2005-02-15

Auduong, Gene N. (Department: 2818)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S211000, C365S233100

Reexamination Certificate

active

06856566

ABSTRACT:
It is an object to provide a timer circuit which exhibits a tendency of decreasing a timer cycle upon a temperature increase and another tendency of increasing the timer cycle upon a temperature decrease. A diode D has a current characteristic depending upon temperature. A forward current flows through an n-type MOS transistor N1which forms a primary side of a current mirror. Another current flowing through a p-type MOS transistor P2and an n-type MOS transistor N3which form a secondary side of the current mirror is defined depending upon the current flowing through the n-type MOS transistor N1. The current flowing through the p-type MOS transistor P2and the n-type MOS transistor N3is supplied as an operating current of a ring oscillator comprising inverters I1˜I3. Accordingly, a cycle (timer cycle) of a clock signal CLK outputted from this ring oscillator reflects a temperature characteristic of the diode D, wherein the timer cycle is decreased with increasing the temperature.

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