Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-08-09
2005-08-09
Tran, Pablo N. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S009000, C455S013300
Reexamination Certificate
active
06928281
ABSTRACT:
An active antenna power interface circuit couples a supply voltage from a radio receiver to an antenna feed. The circuit comprises a DC power input and a power switching element connected in series between the DC power input and the antenna feed. The power switching element has a control input for selecting a conducting state or a nonconducting state of the power switching element. A high side voltage sensor senses a first voltage proportional to a voltage at the DC power input. A low side voltage sensor senses a second voltage proportional to a voltage at the antenna feed. A controller is coupled to the control input and to the voltage sensors. The controller places the power switching element into the conducting state, samples the first and second voltages, calculates a voltage difference in response to the first and second voltages, compares the voltage difference to an upper limit and a lower limit. If the voltage difference is greater than the upper limit then the controller signals a short-circuit fault. If the voltage difference is less than the lower limit then the controller signals an open-circuit fault.
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Ward Dennis Paul
Zerod Richard David
MacMillan Sobanski & Todd LLC
Tran Pablo N.
Visteon Global Technologies Inc.
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