Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1998-06-24
2000-11-21
Hunter, Daniel S.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455102, 455115, 455126, 455127, 455129, H04Q 720
Patent
active
061515094
ABSTRACT:
A transmitter for a cellular phone comprising an antenna and being operable at a first radio frequency band and a second radio frequency band is disclosed. The transmitter comprises a first power amplifier and a second power amplifier. The first power amplifier has a first input for a first signal at the first radio frequency band, a second input for a first control signal and a first output for an amplified first signal. The first output is connectable to the antenna. The second power amplifier has a third input for a second signal at the second radio frequency band, a fourth input for a second control signal and a second output for an amplified second signal. The second output is connectable to the antenna. The transmitter further comprises a single control module which receives a signal indicative of a current an active power amplifier draws. The control module uses this signal indicating the drawn current to generate a control signal to control the active power amplifier.
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Lawrence J. Curran, "RFICs: Dual-Band Cell Phones Emerge"; EDN; May 22, 1997; pp. 21, 22, 24.
Datasheet; "RF230 GSM1800/PC1900 Power Amplifier"; Rockwell Semiconductor Systems; Jan. 14, 1998.
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Datasheet; "RF122 Power Amplifier Controller for Heterojunction Bipolar Transistor Power Amplifiers"; Rockwell Semiconductor Systems; Oct. 13, 1997.
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Fink, Christiansen et. al; Electronics Engineers' Handbook; pp. 25-66-25-70 .
Conexant Systems Inc.
Hunter Daniel S.
Woldetatios Yemane
LandOfFree
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