High-efficiency envelope tracking systems and methods for...

Details High-efficiency envelope tracking systems and methods for... High-efficiency envelope tracking systems and methods for...

2008-05-23

2010-10-05

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

C330S296000

Reexamination Certificate

active

07808323

ABSTRACT:
High-efficiency envelope tracking (ET) methods and apparatus for dynamically controlling power supplied to radio frequency power amplifiers (RFPAs). An exemplary ET circuit includes a switch-mode converter coupled in parallel with a split-path linear regulator. The switch-mode converter is configured to generally track an input envelope signal Venv and supply the current needs of a load (e.g., an RFPA). The split-path linear regulator compensates for inaccurate envelope tracking by sourcing or sinking current to the load via a main current path. A current sense path connected in parallel with the main current path includes a current sense resistor used by a hysteresis comparator to control the switching of the switch-mode converter. The split-path linear regulator is configured so that current flowing in the current sense path is a lower, scaled version of the current flowing in the main current path.

REFERENCES:
patent: 7449954 (2008-11-01), Bocock et al.
patent: 7679433 (2010-03-01), Li
patent: 7755422 (2010-07-01), Schell et al.
patent: 2008/0074207 (2008-03-01), McCune et al.
U.S. Appl. No. 12/022,141, Koji Takinami et al.
F. Wang, “An Improved Power-Added Efficiency 19-dBm Hybrid Envelope . . . ,” IEEE Transactions on Microwave Theory and Techniques, Dec. 2006, pp. 4086-4099, vol. 54, No. 12.

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