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:
Jan. 03, 2006
Filed:
Oct. 20, 2004
Andreas Sibrai, Krottendorf, AT;
Andreas Sibrai, Krottendorf, AT;
Dialog Semiconductor GmbH, Kirchheim/Teck-Nabern, DE;
Abstract
A method and circuits of a high isolation and high-speed buffer amplifier capable to handle frequencies in the GHz range have been achieved. The output to input isolation is primary dependent on the gate-source capacitance of the active buffer transistor. Having two or more in series and by reducing the impedance between them a high isolation can be achieved. The input signals are split in several signal paths and are amplified in the push-pull mode using source follower amplifiers. Then the amplified signals are being combined again. The amplified output current is mirrored applying a multiplication factor. Said method and technology can be used for buffer amplifiers having differential input and differential output or having single input and single output or having differential input and single output. A high reversed biased (output to input) isolation and a reduced quiescent current have been achieved.