Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-02-18
2001-05-08
Chang, Vivian (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S127500
Reexamination Certificate
active
06230031
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to the field of wireless radio transceivers, and more specifically, to the field of providing a multi-leveled power amplifier circuit for use in battery powered wireless radio transceivers. Such wireless radio transceivers are used in wireless telephone systems such as code division multiple access (CDMA), time division multiple access (TDMA), and advanced mobile phone services (AMPS) with the systems operating at multiple frequency ranges.
In battery powered radio transceivers, the maximum transmitted power is typically limited by the magnitude of the battery voltage. An additional concern with battery powered radio transceivers is the need to minimize battery energy drain, or the current drained from the battery, thereby maximizing battery life. Therefore, there is a trade-off between maximizing transmitted power to maximize usable range and minimizing battery energy drain to maximize battery life. This problem is compounded when the radio transceiver is used in an automotive application, where said radios are typically used in the outer fringes of the coverage area of base stations. Power amplifying circuitry has been proposed that uses a secondary battery, such as an automobile battery, to provide the energy source to increase the maximum transmitted power.
Previously proposed power amplifying circuits have typically dealt with radio transceivers operating in older AMPS systems, which operate in a single frequency range around 800 megahertz (MHz). However, with the newly adopted digital wireless cellular telephone standards TDMA and CDMA, cellular telephones are able to operate at multiple different frequency ranges, an example being the operation of CDMA systems at frequency ranges of 800 megahertz (MHz) or 1.9 Gigahertz (GHz). The resulting dual mode battery powered radio transceivers which support these standards must also operate at different frequency ranges, hence the power amplifying circuitry must also support multiple operating frequency ranges.
There is, therefore, a need in the industry for a system addressing these problems, as well as other related and unrelated problems.
BRIEF SUMMARY OF THE INVENTION
A power amplifying system for amplifying the output transmitted power of a mobile, battery powered, radio transceiver includes a secondary voltage source and amplying circuitry including multiple power amplifiers, a central processing unit to control the amplification of the output transmitted signal, and a mechanism for detecting the presence of the radio transceiver. The system preferably performs a method for compensating for the signal losses associated with cabling used in the installation of the amplifying circuitry in an automobile application. According to the first preferred embodiment of the present invention, the method for compensating for signal losses utilizes a manually configured bank of switches. When the amplifying circuitry is installed in the automobile application, the bank of switches is set to specify the amount of loss compensation needed.
According to the first preferred embodiment of the present invention, the multiple amplifiers are used for amplification of the output transmitted signal when the radio transceiver is operating at different frequency ranges or modes. According to the first preferred embodiment of the present invention, the gain of the amplifying circuitry remains fixed during a particular mode. A central processing unit in the radio transceiver communicates with the central processing unit of the amplifying circuitry to identify the mode used by the radio transceiver, thereby effecting the output level of the amplifying circuitry. According to a second preferred embodiment of the present invention, the manually configured set of switches is replaced by an automatic test method. Said test method is applied at system power up to measure the amount of signal loss present in the system.
Objects, features, and advantages of the present invention will become apparent upon reading and understanding the present specification, when taken in conjunction with accompanying drawings.
REFERENCES:
patent: 2678998 (1954-05-01), Young, Jr.
patent: 3065424 (1962-11-01), Whisenhunt
patent: 4307455 (1981-12-01), Juhasz et al.
patent: 4414623 (1983-11-01), Davis et al.
patent: 4455623 (1984-06-01), Wesemeyer et al.
patent: 4510460 (1985-04-01), Tamura
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4636741 (1987-01-01), Mitzaff
patent: 4654882 (1987-03-01), Ikeda
patent: 4850006 (1989-07-01), Sasaki et al.
patent: 4870698 (1989-09-01), Katsuyama et al.
patent: 4928307 (1990-05-01), Lynn
patent: 4947455 (1990-08-01), Swanson
patent: 5036532 (1991-07-01), Metroka et al.
patent: 5048117 (1991-09-01), Aisaka et al.
patent: 5107487 (1992-04-01), Vilmur et al.
patent: 5109541 (1992-04-01), Park
patent: 5121504 (1992-06-01), Toko
patent: 5144258 (1992-09-01), Nakanishi et al.
patent: 5146614 (1992-09-01), Furuno
patent: 5164680 (1992-11-01), Mahabadi
patent: 5175871 (1992-12-01), Kunkel
patent: 5193219 (1993-03-01), Tamura
patent: 5214505 (1993-05-01), Rabowsky et al.
patent: 5239690 (1993-08-01), Heinonen
patent: 5276918 (1994-01-01), Cornforth et al.
patent: 5303395 (1994-04-01), Dayani
patent: 5369803 (1994-11-01), Hirsawa et al.
patent: 5442322 (1995-08-01), Kornfeld et al.
patent: 5442618 (1995-08-01), Dewey et al.
patent: 5450620 (1995-09-01), Vaisanen
patent: 5457814 (1995-10-01), Myrskog et al.
patent: 5467055 (1995-11-01), Wray et al.
patent: 5481226 (1996-01-01), Parkes, Jr.
patent: 5511234 (1996-04-01), Ha
patent: 5524044 (1996-06-01), Takeda
patent: 5551067 (1996-08-01), Hulkko et al.
patent: 5752171 (1998-05-01), Akiya
patent: 5754962 (1998-05-01), Griffin
patent: 5802167 (1998-09-01), Hong
patent: 5812097 (1998-09-01), Maldonado
patent: 5898908 (1999-04-01), Griffin et al.
patent: 5937336 (1999-08-01), Kumagai
patent: 5995813 (1999-11-01), Ishikura et al.
patent: 6032054 (2000-02-01), Schwinke
patent: 60-117958 (1985-06-01), None
Appiah Charles N.
Chang Vivian
Oki Telecom, Inc.
Thomas Kayden Horstemeyer & Risley LLP
LandOfFree
Power amplifying circuitry for wireless radio transceivers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power amplifying circuitry for wireless radio transceivers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power amplifying circuitry for wireless radio transceivers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2532538