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. 12, 1989
Filed:
Jan. 27, 1989
William R Frensley, Richardson, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An energy filter for carriers in semiconductor devices and devices with such filters are disclosed. The filter is a superlattice and the filtering action arises from the subbands and gaps in the conduction and valence bands of the superlattice. A heterojunction bipolar transistor with the filter between the emitter and base has carriers injected from the emitter into the base with energies confined to levels that minimize transit time across the base; a MESFET with a filter between a heterojunction source to channel has carriers injected with energies confined to minimize transit time across the channel. A diode with a filter in front of a drift region limits the spread of energies of injected carriers.