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:
Dec. 16, 1980
Filed:
Sep. 14, 1978
Derrick O Perkins, Raleigh, NC (US);
Telex Computer Products, Inc., Tulsa, OK (US);
Abstract
A frequency tracking, adjustable duty cycle ratio pulse generator that accepts an incoming stream of equally time spaced spike pulses, which go to a first input of an OR gate. The output of the OR gate is fed back to a comparator which has a reference voltage on one input terminal, and receives the feedback voltage from the output of the OR gate through a first switch and through a capacitor. There is a shunt circuit around the capacitor that includes a series resistor and a second switch. The output of the capacitor also connects to a second resistor, to ground. In operation, the first switch is closed when the output of the OR gate is high and when the first switch is closed, the second switch is open, and vice versa. The duty cycle ratio is dependent upon the rate of charge of the capacitor, which is controlled by the capacitance and the second resistor. The period of the output pulses is controlled by the discharge of the capacitor through the first resistor, which is determined by the time constant of the capacitance and the first resistance. A second embodiment has an OR gate which serves not only to control the pulsing of the output circuit, but also provides the reference voltage which controls the pulsing.