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:
Sep. 29, 1992
Filed:
May. 17, 1991
Kazunori Nishijima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An oscillation circuit has a differential amplifier including a constant current source formed by a resistor and a transistor whose emitter is grounded through the resistor, and a feedback circuit through which an output of the differential amplifier is positively fed back to an input of the same differential amplifier. The oscillation circuit further includes a band-gap regulator for producing a band-gap voltage proportional to a thermal voltage of transistors forming the band-gap regulator whose emitter areas are different with each other, and an operational amplifier for DC-amplifying the band-gap voltage and applying the amplified band-gap voltage to the base of the transistor forming the constant current source. The oscillation circuit is capable of performing a stable oscillation against a wide range of temperature changes.