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. 21, 2002
Filed:
Jan. 11, 2000
Teresa Anne Muhlbauer, Cary, NC (US);
Ronald Oliver, Cary, NC (US);
Ericsson Inc., Reseach Triangle Park, NC (US);
Abstract
Difference frequency impedance transformation circuits for power amplifiers can change the impedance presented to an input of a power amplifier at a frequency that is a function of a difference between the receive and transmit frequency ranges. The difference frequency impedance transformation circuit may, therefore, reduce the noise at the difference frequency which may otherwise be mixed with the transmit frequencies to produce noise in the receive frequency range. In particular, difference frequency impedance transformation circuits can include a first circuit that conducts the first signals to an input of the power amplifier. A second circuit is electrically coupled to the input of the power amplifier and changes the impedance presented to the input of the power amplifier at the difference frequency. Related power amplifier systems, wireless user terminals, and methods are also disclosed.