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:
Apr. 08, 2003
Filed:
Aug. 11, 1999
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An object of the present invention to provide a pulse width modulation waveform generating circuit that it is possible to reduce circuit size and power consumption. A pulse width modulation waveform generating circuit comprises a ring oscillator having 64 pieces of inverters connected in series, inverters connected to output terminals of odd numbered stages of inverters in the ring oscillator, a multiplexer, a change detecting circuit, and an RS flip-flop. The multiplexer is supplied with output signals of even numbered stages of the inverters in the ring oscillator and output signal of the inverter. One of their signals is selected in accordance with logic of a digital signal. The RS flip-flop is set at time an edge detecting pulse is outputted from the change detecting circuit, and is reset at time an edge detecting pulse is outputted from the change detecting circuit.