Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1997-02-13
1999-03-16
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Plural separate transmitters or channels
455126, 455127, 455553, H04B 104
Patent
active
058841490
ABSTRACT:
A multi-band mobile station (10) includes a plurality of RF amplifier sections, one for each frequency band of interest; a controller (18) for selectively enabling, when transmitting, only one of the RF amplifier sections; a directional coupler circuit for detecting the power of an amplified RF signal that is output from the enabled one of the RF amplifier sections; and a single error detection circuit, coupled to the detecting circuit, for generating an error signal. The error signal has a magnitude that is indicative of a difference between the detected power and a desired power. The error signal is coupled to the enabled one of the RF amplifier sections so as to minimize the magnitude of the error signal. The controller may place a non-enabled RF amplifier section into a low power consumption mode. The directional coupler circuit includes an RF detector coupled to the directional coupler, and an impedance matching circuit coupled between the directional coupler and the RF detector. The impedance matching circuit operates so as to cause the signal output from the RF detector to have about the same magnitude for a given level of output power from any one of the enabled RF amplifier sections. In an illustrative embodiment of this invention one frequency band of interest includes 836 MHz, and another frequency band of interest includes 1880 MHz.
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Eisenzopf Reinhard J.
Kincaid Lester G.
Nokia Mobile Phones Limited
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