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:
Jun. 15, 1993
Filed:
Jun. 01, 1992
Todd L Brooks, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A continuous-time differential amplifier (52, 100) preserves fast settling time while reducing a relatively-high offset voltage-normally associated with a continuous-time differential amplifier using MOS load transistors. The differential amplifier (52, 100) includes a first transistor (81) biased as a current source to provide current into emitters of second (82) and third (83) emitter-coupled input transistors. Fourth (84) and fifth (85) load transistors are respectively coupled between collectors of the second (82) and third (83) input transistors and a power supply voltage terminal. An amplifier (70) having a positive input terminal coupled to the collector of the second input transistor (82) and a negative input terminal receiving a bias voltage biases the control electrodes of the load transistors (84, 85). The amplifier (70) increases the effective transconductance of the load transistors (84, 85) to allow larger control electrode areas, which reduces the effect of transistor mismatch.