Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2006-02-07
2006-02-07
Nguyen, Duc M. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S423000, C455S572000, C455S277100, C455S289000, C323S234000, C323S282000, C363S074000
Reexamination Certificate
active
06996389
ABSTRACT:
A power supply for a satellite receiver system includes a dual input supply voltage arrangement. When a higher output voltage is selected, a source of a lower supply input voltage is coupled to an input main current conducting terminal of a series pass transistor. On the other hand, when a lower output voltage is selected, a source of a lower supply input voltage is coupled to the input main current conducting terminal of the series pass transistor. A comparator senses a magnitude of an output voltage produced by the series pass transistor. When, as a result of an over current condition, the output voltage is lower than a reference threshold level, any selection of the higher output voltage is automatically overridden and the source of the lower supply input voltage, instead, is coupled to the input main current conducting terminal of the series pass transistor.
REFERENCES:
patent: 5216434 (1993-06-01), Fukumura
patent: 5563500 (1996-10-01), Muterspaugh
patent: 5826170 (1998-10-01), Hirschfield et al.
patent: 5828206 (1998-10-01), Hosono et al.
patent: 6061577 (2000-05-01), Andrieu et al.
patent: 6434025 (2002-08-01), Shirai et al.
patent: 6532424 (2003-03-01), Haun et al.
patent: 6928281 (2005-08-01), Ward et al.
Copy of Search Report Dated Jul. 24, 2003.
Bowyer Andrew Eric
Curtis, III John Joseph
Fitzpatrick John James
Leley Suresh Vishwanatm
Pitsch Robert Alan
Fried Harvey D.
Johnson Christine
Nguyen Duc M.
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