Abstract: A linearized amplifier comprising a RF input for receiving a modulated signal and a RF output for supplying a linearly amplified modulated signal. The RF input is connected to a first junction. The linearized amplifier further comprises a linearizer having an input connected to the first junction and a output connected to a second junction. The first junction defines a first path connected to the second junction through the linearizer for linearizing the modulated signal at a first defined range of power and a second path connected to the second junction bypassing the linearizer at a second defined range of power. The linearized amplifier further comprises a amplifier having a input connected to the second junction and a output connected to the RF output for supplying the linearly amplified modulated signal.

Abstract: A system and method for combining the downlink signals from at least two transceivers to increase the power of the downlink signal. In-phase down link signals from at least two transceivers are combined to produce a downlink output signal having an output power level greater than the power level of any single downlink signal. Detector means, which samples the downlink signals to identify a phase difference is coupled to control a phase controller which adjusts the phase of at least one of the downlink signals to be in step with the phase of the other downlink signal. The phase controller maintains the downlink signals in phase by shifting the phase of at least one of the downlink signals relative to the other.

Abstract: For measuring gain error in a receiver of a base station of a cellular system and for improving field strength measurement, a signal received by the base station is measured before and after a receiver unit. The power level is corrected after the receiver unit to correspond to the power level of the signal determined before the receiver unit. For this purpose, before the receiver unit an accurate detector of the power level of the signal is provided, the power level of the signal detected by the detector being compared to the power level measured after the receiver.