Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-05-22
2007-05-22
Pert, Evan (Department: 2826)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S272000, C323S282000, C327S530000, C327S547000, C327S590000
Reexamination Certificate
active
11101473
ABSTRACT:
A DC-DC converter for generating power supply voltage differing from input voltage, while operating a semiconductor circuit at a predetermined speed regardless of differences between devices or changes in the operation environment. An output voltage control circuit compares an oscillation signal, which is provided from a ring oscillator of the semiconductor circuit, with a triangular wave signal, which is provided from an oscillator of the DC-DC converter, and changes the output voltage of the DC-DC converter in accordance with the comparison result. This substantially equalizes the oscillation signal of the ring oscillator with the triangular wave signal, which functions as a reference signal, and operates the semiconductor circuit at a speed that is in accordance with the triangular wave signal.
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patent: 6469483 (2002-10-01), Katayama
patent: 6603671 (2003-08-01), Tokunaga et al.
patent: 6979981 (2005-12-01), Yoshikawa
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Ito Hidenobu
Ogawa Yasushige
Ozawa Hidekiyo
Tsuchiya Chikara
Arent & Fox PLLC
Fujitsu Limited
Pert Evan
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