Telefonaktiebolaget Lm Ericsson (publ)

Jiangyan Peng

Lei Zhang

Jichang Liao

Zhanyu Wu

Xiaoliang Du

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 tower mounted amplifier and a filter. The filter includes a transmission part having a first tunable portion and a reception part having a second tunable portion and a third tunable portion. The transmission part is coupled between a first port and a second port. The second tunable portion of the reception part is coupled between the first port and a third port, and the third tunable portion of the reception part is coupled between a fourth port and the second port. The first tunable portion is configured to work in a first frequency range different from a first pass band in which the second and third tunable portions are controlled to work when a radio frequency signal is to be transmitted from the first port to the second port, the radio frequency signal being rejected by the first tunable portion to the second port.

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Beijing, China

Jiangyan Peng