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:
Mar. 15, 1988
Filed:
Jul. 25, 1986
Donald R Preslar, Plainsboro, NJ (US);
RCA Corporation, Somerville, NJ (US);
Abstract
Level shifter circuitry, as for an operational amplifier, imposes no current load on the preceding amplifier stage associated with its level shifter function. A common-collector-amplifier first transistor has base and emitter connections to the input and output terminals of the level shifter. A second transistor of similar conductivity type and common-collector forward current gain has its base electrode connected through a first current mirror amplifier to the input terminal of the level shifter and has its emitter electrode connected through a second current mirror amplifier to the output terminal of the level shifter. The first and second current mirror amplifiers have similar current gains. The first current mirror amplifier may also be incorporated in apparatus for supplying constant current loading to the preceding amplifier stage, to this end having a source of constant current connected to its input connection.