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:
May. 10, 1994
Filed:
Sep. 18, 1992
Michael R Engbretson, Aloha, OR (US);
Garry N Link, Aloha, OR (US);
Tektronix, Inc., Wilsonville, OR (US);
Abstract
An integrated oscillator includes an amplifier having first and second voltage inputs, and first and second current outputs, and a current mirror having an input coupled to the second current output of the amplifier and an output coupled to the first current output of the amplifier. The output of the current mirror and the first current output of the amplifier are coupled through a bonding pad to an external capacitor. A first comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a first threshold voltage, and a second comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a second threshold voltage. A flip-flop has a first input coupled to the output of the first comparator, a second input, and an output coupled to the second voltage input of the amplifier. A first multiplexer has a first input for receiving a reference voltage, a second input coupled to the output of the second comparator, and an output coupled to the first voltage input of the amplifier. A second multiplexer has a first input coupled to the output of the second comparator, a second input for receiving an enable signal, and an output coupled to the second input of the flip-flop. The output of the second comparator forms a one-shot output node responsive to the enable signal, and the output of the flip-flop forms a free-running oscillator output node.