The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1994
Filed:
May. 21, 1992
Tsukasa Shirotori, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An output circuit comprises an output transistor, a reference oscillator, a variable frequency oscillator, and a control circuit. The reference oscillator produces a first signal of a reference frequency according to the ideal ON resistance of the output transistor. The variable frequency oscillator generates a second signal capable of varying the oscillation frequency. The phase comparator compares the phase of a first signal from the reference oscillator with that of a second signal from the variable frequency oscillator and then controls the oscillation frequency of the variable frequency oscillator so that these two phases may coincide with each other. The control circuit controls the output transistor so that the current driving capability may be kept constant according to the output of the phase comparator.