Patent
Continuous closed-loop power control system including modulation injection in a wireless transceiver power amplifier
Dmitriy Rozenblit,Morten Damgaard,Russell J. Fagg,Domino William J +3 more
- 18 Mar 2003
66
TL;DR: In this article, a single continuous closed-loop power control feedback system was proposed to provide seamless power control for a power amplifier and also enable an AM signal to be injected into the power amplifier through the power amplifiers' control port.
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Abstract: A single continuous closed-loop power control feedback system provides seamless power control for a power amplifier and also enables an AM signal to be injected into the power amplifier through the power amplifiers' control port. The AM signal is developed by an I/Q modulator and supplied to a comparator located in the power control loop. By using leakage from the power amplifier as feedback to a phase locked loop during initial power amplifier power ramp-up, the single continuous closed-loop power control system provides continuous feedback to the phase locked loop during the entire power amplification ramp-up period and eliminates the need for multiple feedback loops.
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Citations
Patent
Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios
Wen-Yen Chan,Nasserullah Khan,Qingzhong Jiao,Xin Jin,Nagula Tharma Sangary,Michael F. Habicher +5 more
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References
Patent
Power amplifier having nested amplitude modulation controller and phase modulation controller
Black Gregory Redmond,Hietala Alexander W +1 more
- 22 Dec 1994
TL;DR: In this paper, the amplitude modulated (AM) and phase modulation (PM) components are nested about a power amplifier (PA), allowing the PM control loop to correct for any distortion introduced by the PA.
166
Patent
IQ modulation systems and methods that use separate phase and amplitude signal paths and perform modulation within a phase locked loop
Erik Bengtsson,Aristotle Hadjichristos,Scott R. Justice +2 more
- 22 Dec 2000
TL;DR: In this paper, a phase-locked loop is proposed for a digital signal processor to produce in-phase, quadrature-phase and amplitude signals from a baseband signal, where the modulator may be placed in the feedback loop between the controlled oscillator output and the mixer.
147
Patent
Quadrature modulated phase-locked loop
Ross W. Lampe
- 26 Apr 1993
TL;DR: A phase-locked loop incorporates a quadrature modulator for generating constant envelope phase or frequency modulation as mentioned in this paper, where the output signal of the modulator is fed into the feedback loop to suppress undesired AM and PM components of the signal.
121
Patent
Range repeater for a transmission system
Qi Bi,Robert Evan Myer +1 more
- 11 Dec 1997
TL;DR: In this article, the authors proposed a repeater for a telecommunications transmission system such as a CDMA wireless system, which reduces leakage by means of a feedback signal whose amplitude and phase are adjusted in response to the amplitude of a sampled input signal when a switch turns off the normal output of the repeater.
114
Patent
Method and system for generating a power control command in a wireless communication system
Mansoor Ahmed,Louay Jalloul,Kamyar Rohani +2 more
- 06 Oct 1998
TL;DR: In this article, a power control command to control power of a transmitted traffic channel was used to adjust the traffic signal quality threshold in response to whether or not a frame error is detected.
80