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:
May. 05, 2009
Filed:
May. 24, 2007
Giovanni Sicurella, Mascalucia, IT;
Manuela LA Rosa, Giarre, IT;
Donata Rosaria Nicolosi, Catania, IT;
Giovanni Sicurella, Mascalucia, IT;
Manuela La Rosa, Giarre, IT;
Donata Rosaria Nicolosi, Catania, IT;
STMicroelectronics, S.r.l., Agrate Brianza (MI), IT;
Abstract
An analog transconductance amplifier includes an input stage including a first transistor and a second transistor connected in series to the first transistor. The first and second transistors are connected between positive and negative voltages and are respectively controlled by an input voltage and a first control voltage for generating a normalized drive voltage. An amplification stage includes a first conduction path including an amplification transistor controlled by the normalized drive voltage. A first load transistor is connected in series to the amplification transistor and is controlled by a second control voltage. A second conduction path includes at least one second load transistor controlled by a third control voltage. A current mirror forces through the second conduction path a replica of current flowing through the first conduction path. An output stage transistor delivers an output current, and is controlled by a voltage on the second load transistor. All of the transistors in the analog transconductance amplifier are field effect transistors of a same conductivity type.