Telefonaktiebolaget Lm Ericsson (publ)

Zhanyu Wu

Lei Zhang

Jiangyan Peng

Xiaolong Yue

According to embodiments of the present disclosure, circuitry () and method () are provided for controlling a power amplifier () in a transmit/receive switching system. The circuitry () comprises a load circuit () for at least partly reducing a magnitude of a swing of a power supply voltage caused by a variation in load of the transmit/receive switching system that occurs upon initiation of a transmission by the transmit/receive switching system. The circuitry () further comprises a first switch (), coupled in series with the load circuit (), operable to switch on to couple the power supply voltage to a ground voltage via the load circuit (). The circuitry () further comprises a control circuit () configured to switch on the first switch () at a first timing, and to switch off the first switch () and turn on the power amplifier () at a second timing. The first timing is a time interval ahead of the second timing.

Circuitry and method for controlling a power amplifier in a transmit/receive switching system

A driver circuit for a power amplifier of a radio base station. The driver circuit comprises a radio frequency input, an output for connection to a power amplifier, a combiner connected to the radio frequency input and a first bias leg. The first bias leg comprises a bias source input, a first capacitor leg and a second capacitor, wherein the first capacitor leg is connected between the combiner and ground, and the second capacitor is connected between the combiner and ground. The first capacitor leg comprises a first switch and a first capacitor, the first switch being provided between the combiner and the first capacitor such that, in a first state, the first capacitor is connected to the combiner and, in a second state, the first capacitor is disconnected from the combiner. A corresponding power amplifier assembly, radio base station and method are also presented.

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Beijing, China

Zhanyu Wu