Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2007-05-25
2008-12-30
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C330S296000
Reexamination Certificate
active
07471155
ABSTRACT:
The present invention is ripple cancellation circuitry used with a switching power supply, which provides direct current (DC) power via a DC power amplifier (PA) signal to an RF PA final stage. The DC PA signal includes a DC component and a power supply ripple component, which is generated as a result of the switching characteristics of the switching power supply and creates an output ripple in an RF output signal from the PA final stage. The ripple cancellation circuitry substantially cancels the output ripple by adding a ripple cancellation signal having a ripple component that is phase-shifted approximately 180 degrees from the output ripple to the RF output signal. The ripple cancellation circuitry uses a switching signal that is provided by the switching power supply to generate the ripple cancellation signal.
REFERENCES:
patent: 4357579 (1982-11-01), Kato et al.
patent: 4543539 (1985-09-01), Seki et al.
patent: 6483727 (2002-11-01), Oki et al.
patent: 6489755 (2002-12-01), Boudreaux et al.
patent: 7403400 (2008-07-01), Stanley
Choe Henry K
RF Micro Devices, Inc.
Withrow & Terranova, P.L.L.C.
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