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. 05, 1988
Filed:
Sep. 24, 1986
Hisakazu Hitomi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An emitter-coupled astable multivibrator capable of reducing a temperature drift of an oscillation frequency to zero is disclosed. The multivibrator includes first and second transistors, the emitters and collectors of which are cross-coupled, and which are turned ON and OFF at given intervals in accordance with the control current; a capacitor, connected between the emitters of the first and second transistors, to be charged and discharged, the charging polarity of the capacitor being alternately inverted upon the turning ON/OFF of the first and second transistors; third and fourth transistors, the bases of which are commonly connected to a power source circuit, and the emitters of which are respectively connected to the collectors of the first and second transistors; and a fifth transistor, the base of which is connected to the power source circuit to have a predetermined potential difference from the base potentials of the third and fourth transistors, and the emitter of which is connected to the collectors of the first and second transistors through first and second resistors, respectively. The emitter current density of the fifth transistor is different from that of the third or fourth transistor to compensate for the temperature drift.