Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2008-05-27
2009-10-27
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
Reexamination Certificate
active
07609114
ABSTRACT:
The invention provides a voltage generating apparatus for powering at least one amplifier. The voltage generating apparatus comprises a voltage source, a switched capacitor voltage converter and a voltage detector. The voltage source supplies a first voltage to a positive voltage input terminal of the at least one amplifier. The first voltage is a positive DC voltage. The switched capacitor voltage converter is coupled to the voltage source for outputting an output voltage to a negative voltage input terminal of the at least one amplifier according to the first voltage and a predetermined voltage. The output voltage is a negative DC voltage. The voltage detector is coupled to the switched capacitor voltage converter for determining a switching frequency corresponding to the predetermined voltage according to the output voltage. The switched capacitor voltage converter increases the output voltage when the switching frequency is decreased and decreases the output voltage when the switching frequency is increased.
REFERENCES:
patent: 5289137 (1994-02-01), Nodar et al.
patent: 7061327 (2006-06-01), Doy
patent: 7382195 (2008-06-01), Chen et al.
patent: 7471155 (2008-12-01), Levesque
Hsieh Chung-An
Li Cheng-Tao
Birch & Stewart Kolasch & Birch, LLP
Nguyen Khanh V
UPI Semiconductor Corporation
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