Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1997-06-23
2000-04-04
Bost, Dwayne D.
Telecommunications
Transmitter
With feedback of modulated output signal
455 91, 455127, 330285, H04B 104
Patent
active
060471689
ABSTRACT:
The present invention relates to a device and a method in a transmitter stage in a radio transmitter for modulating and amplifying an information signal for further transmission through a radio channel. The transmitter stage in the radio transmitter comprises a converting device (5) PCH, an amplifier control device (8) PAC, a power detector (13) and a power amplifier (2). Examples of the problems solved by the present invention are difficulties in reducing the power consumption, non-linearities in the output signal when using non-linear amplifiers in radio transmitters, and achieving a high signal-to-noise ratio in the output signal without connecting filter arrangements after such an amplifier. The solution according to the inventive method and device utilizes an information signal which has in earlier steps been divided in its polar components: a phase reference component signal (E.sub.phr) and an amplitude component signal (A.sub.amp). The phase reference component phase modulates a low noise high power signal source which has a constant amplitude. The amplitude of the obtained signal is then formed in an amplifier, which is controllable with the amplitude component signal (A.sub.amp). Its current consumption is registered and compared to a control value for the current. The amplifier is controlled towards this control value.
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V. Petrovic W. Gosling, Polar-Loop Transmitter, Electronic Letters, 10th May 1979, vol. 15, No. 10, pp 286-287.
V. Petrovic et al., Reduction of Intermodulation Distortion by Means of Modulation Feedback, IEE Collocquim on Intermodulation, Apr. 9, 1984, pp 8/1-8/8.
Carlsson Torsten
Hellmark Martin
Bost Dwayne D.
Telefonaktiebolaget LM Ericsson
Trinh Sonny
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