Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate
1999-12-21
2001-04-17
Pascal, Robert (Department: 2817)
Amplifiers
Combined with automatic amplifier disabling switch means
C330S127000, C330S126000, C330S297000
Reexamination Certificate
active
06218897
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to telecommunication systems. More specifically, the present invention is directed to systems and methods for reconfiguring a power amplifier during a power outage.
BACKGROUND OF THE INVENTION
Modern communication systems provide an increasing number of services to consumers. For example, wireline telecommunications systems previously provided simultaneous voice and data service, while wireless telecommunications provided either voice service or data service, but not both simultaneously. Lately, wireless telecommunication systems provide simultaneous voice and data services by increasing communication channel bandwidth to handle the increased service requirements.
As the bandwidth of a system increases, the power required for amplifying signals within the bandwidth correspondingly increases. Many communication systems use a battery backup during a power outage. Unfortunately, battery lifetime decreases as system bandwidth increases. Consequently, battery-backup systems are becoming increasingly less reliable.
Accordingly, there is a need for a communication system that operates in a manner that increases the battery lifetime of a battery backup, thereby increasing the reliability of the battery back up.
SUMMARY OF THE INVENTION
The present invention provides a communication system that operates in a manner that increases the battery lifetime of a battery backup, thereby increasing the reliability of the battery backup.
The advantages of the present invention are provided by a power amplifier that reconfigures itself during a power outage and amplifies only a selected bandwidth when the battery backup is in use. In that regard, the information associated with the essential services provided by a communication channel is arranged to be within a selected portion bandwidth of the channel. During a power outage, the power amplifier of the present invention amplifies only the selected portion of the bandwidth, which contains the essential services provided by the communication channel. The battery lifetime of the battery backup is accordingly increased.
According to the invention, a power amplifier includes a first amplifier having a first operational bandwidth and a second amplifier having a second operational bandwidth that is narrower than the first operational bandwidth. A primary power source is connected to a first input port of a transfer switch and a battery is connected to a second input port of the transfer switch. The power amplifier also includes a controller for controlling the transfer switch to connect the first amplifier to the primary power source during a primary mode of operation, and for controlling the transfer switch to connect the second amplifier to the battery when the primary power source malfunctions.
REFERENCES:
patent: 4115739 (1978-09-01), Sano et al.
patent: 4644301 (1987-02-01), Hecht
patent: 4801890 (1989-01-01), Dolby
patent: 5164680 (1992-11-01), Mahabadi
patent: 6118343 (2000-09-01), Winslow
Barzegar Farhad
Gerszberg Irwin
Okoro Jeremiah
AT&T Corp
Nguyen Patricia T.
Pascal Robert
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