Double transformer balun for maximum power amplifier power

Details Double transformer balun for maximum power amplifier power Double transformer balun for maximum power amplifier power

2011-02-22

2011-12-27

Eng, George (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S114300

Reexamination Certificate

active

08086263

ABSTRACT:
Double transformer balun for maximum PA (Power Amplifier) power. A novel approach is presented herein by which conversion from a differential signal to single-ended signal may be achieved using a double transformer balun design. The secondary coils of the double transformer balun also operate as a choke for the PA supply voltage. The secondary coils can operate as an RF (Radio Frequency) trap or choke to keep any AC (Alternating Current) signal components and to pass any DC (Direct Current) components. By using a double transformer balun design, relatively thinner tracks may be employed thereby ensuring a high degree of electromagnetic coupling efficiency and high performance. Also, these relatively thinner tracks consume a relatively small amount of space on the die. The double transformer balun design also includes a matching Z (impedance) block that is operable to match the Z of an antenna or line that the PA is driving.

REFERENCES:
patent: 4547705 (1985-10-01), Hirayama et al.
patent: 5262932 (1993-11-01), Stanley et al.
patent: 7904108 (2011-03-01), Castandeda et al.
patent: 2004/0022075 (2004-02-01), Perry
patent: 2004/0196129 (2004-10-01), Camwell et al.

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