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:
Feb. 05, 1991
Filed:
Feb. 07, 1990
Stephen C Kwan, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An amplifier circuit (10) is provided which comprises a first transistor (12) and a second transistor (14). A current buffer circuit (16) is coupled to the basis of the transistors (12, 14) to provide base drive current. A voltage proportional to absolute temperature, V.sub.PTAT, is applied between the emitters of the transistors (12,14). An input current is received by the transistor (12) and an output current is generated by the transistor (14). The output current I.sub.out is amplified with respect to the input current I.sub.in by a gain factor which is substantially independent of temperature considerations. Circuitry is provided for altering the value of the voltage proportional to the absolute temperature, V.sub.PTAT, such that the gain of the amplifier circuit (10) is programmable.