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:
Nov. 01, 1994
Filed:
Oct. 20, 1993
Raymond L Barrett, Jr, Ft. Lauderdale, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An operational transconductance amplifier (38) is coupled to first and second supply voltages (41, 42) for converting differential input signals into a proportional output current. The operational transconductance amplifier (38) has a predetermined common mode input range, and a differential amplifier input stage (28, 29) having a non-inverting input (Vin+), and an inverting input (Vin-). The non-inverting and inverting inputs (Vin+, Vin-) receives differential input signals. Parallel connected transistors (36, 37) are coupled to the differential amplifier input stage (28, 29) for receiving the differential input signals. A current mirror (20-23) has first and second current paths, wherein the first current path sinks a common mode current from the differential amplifier stage, and wherein the second current path diverts the common mode current from the differential amplifier input stage (28, 29) in the event that the differential input signals fall below a predetermined magnitude.