RF power amplifier

Details RF power amplifier RF power amplifier

2011-08-02

2011-08-02

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S307000

Reexamination Certificate

active

07990220

ABSTRACT:
A reduction is achieved in the primary-side input impedance of a transformer (voltage transformer) as an output matching circuit without involving a reduction in Q-factor. An RF power amplifier includes transistors, and a transformer as the output matching circuit. The transformer has a primary coil and a secondary coil which are magnetically coupled to each other. To the input terminals of the transistors, respective input signals are supplied. The primary coil is coupled to each of the output terminals of the transistors. From the secondary coil, an output signal is generated. The primary coil includes a first coil and a second coil which are coupled in parallel between the respective output terminals of the transistors, and each magnetically coupled to the secondary coil. By the parallel coupling of the first and second coils of the primary coil, the input impedance of the primary coil is reduced.

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patent: 7576607 (2009-08-01), Lee et al.
patent: 7777570 (2010-08-01), Lai
F.H. Raab et al., RF and Microwave Power Amplifier and Transmitter Technologies—Part 2, High Frequency Electronics, May 2003, pp. 22-36.
W. Simbürger et al., A Monolithic Transformer Coupled 5-W Silicon Power Amplifier with 59% PAE at 0.9 GHz, IEEE Journal of Solid-State Circuits, vol. 34, No. 12, Dec. 1999, pp. 1881-1892.
I. Aoki et al., Fully Integrated CMOS Power Amplifier Design Using the Distributed Active-Transformer Architecture, IEEE Journal of Solid-State Circuits, vol. 37, No. 3, Mar. 2002, pp. 371-383.
K.H. An et al., A Monolithic Voltage-Boosting Parallel-Primary Transformer Structures for Fully Integrated CMOS Power Amplifier Design, 2007 IEEE Radio Frequency Integrated Circuits Symposium, Jun. 3-5, 2007, pp. 419-422.
Haldi, Peter, et al, “A 5.8 GHz Linear Power Amplifier in a Standard 90nm CMOS Process using a 1V Power Supply”, IEEE Radio Frequency Integrated Circuits Symposium, 2007, pp. 431-434.
Degani, Ofir, et al, “A 90-nm CMOS Power Amplifier for 802.16e (WiMAX) Applications”, IEEE, 2010, pp. 1431-1437.

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