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:
Jul. 20, 2004
Filed:
Mar. 07, 2003
Michael G. Kane, Skillman, NJ (US);
Sarnoff Corporation, Princeton, NJ (US);
Abstract
A radio frequency (RF) pulse power amplifier biased with a relatively low supply voltage generates one or more RF pulses having a relatively large output power. The RF pulse power amplifier may be configured as a push-pull power amplifier operating in class D mode including first and second sections, balanced-to-unbalanced (balun) transformer, and a load resistor coupled across the output winding of the balun transformer. Each section has a current source providing bias current, a MOS transistor, and a pair of bipolar transistors. Each section receives its input digital signal at the MOS transistor, which acts as a current switch for a bias current from a current source. With a relatively small voltage change in response to the input digital signal, the MOS transistor switches the bias current between itself and a transistor pair used to drive the corresponding half (input winding) of the balun transformer.