Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1998-06-24
2000-11-28
Hunter, Daniel S.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455103, 455126, 455127, H04B 109
Patent
active
06154664&
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, one of which is active at a time. The first power amplifier has an input for a first signal at the first radio frequency band, an 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 an input for a second signal at the second radio frequency band, an 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 associated with the first and second outputs of the power amplifiers. The control module generates a control signal for the active power amplifier. The control signal forms part of a feedback control loop, and is a function of the amplified signal output from the active power amplifier and a reference signal which defines a desired characteristic of the amplified signal.
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Chorey Christopher M.
Koullias Iconomos A.
Steigerwald Luke T.
Conexant System, Inc.
Hunter Daniel S.
Tran Pablo
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