Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2006-02-28

2006-02-28

Kinkhead, Arnold (Department: 2817)

Oscillators

Ring oscillators

C331S176000, C331S066000, C331S175000

Reexamination Certificate

active

07005931

ABSTRACT:
An oscillator circuit having an oscillation period moderately varying such that it is short at high temperature but long at low temperature and wherein a maximum value of oscillation period at low temperature can be set. By coupling a resistance parallel circuit having a resistance element having a resistance value decreasing with increasing temperature and a resistance element having a resistance value nondependent upon temperature at between the main electrodes of PMOST and NMOST, the output signal of an inverter is caused to vary with temperature. A ring oscillator circuit outputs an oscillation period short at high temperature but long at low temperature. Meanwhile, because oscillation period is greatly affected by a resistance value of the resistant element not dependent upon temperature at low temperature, a maximum value of oscillation period can be set.

REFERENCES:
patent: 6163225 (2000-12-01), Sundaram et al.
patent: 6803831 (2004-10-01), Nishikido
patent: 05-299982 (1993-11-01), None
patent: 05-307882 (1993-11-01), None

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