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. 28, 1982
Filed:
Jun. 24, 1981
Sony Corporation, Tokyo, JP;
Abstract
A constant current generating circuit is provided which comprises first, second, third and fourth transistors of one conductivity type, each having base, emitter and collector electrodes, and a voltage supply source having first and second voltage terminals. In this case, the collector and emitter electrodes of the first transistor are respectively connected to the first and second voltage terminals with a first impedance between the collector electrode and first voltage terminal; the emitter electrode of the second transistor is connected to the second voltage terminal through a second impedance; the emitter electrode of the third transistor is connected to the second voltage terminal through a third impedance; the emitter electrode of the fourth transistor is connected to the second voltage terminal; the base electrode of the first transistor is connected to the emitter electrode of the second transistor; the collector electrode of the first transistor is connected commonly to the base electrodes of the second and third transistors; the emitter electrode of the third transistor is connected to the base electrode of the fourth transistor; and a current utilizing means is connected between the first voltage terminal and at least one of the collector electrodes of the second, third and fourth transistors.