Bypass arrangement for low-noise amplifier

Details Bypass arrangement for low-noise amplifier Bypass arrangement for low-noise amplifier

2005-08-09

2005-08-09

Tran, Anh Q. (Department: 2819)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S203000, C455S232100

Reexamination Certificate

active

06927646

ABSTRACT:
An arrangement for bypassing a low-noise amplifier (LNA), intended especially to be used in base stations of mobile networks. For the bypass, a receiver antenna filter (210) has a second output (OUT2) parallel with a first output (OUT1) connected to the LNA. The antenna filter is of the resonator type, and there is a conductive element for each of its outputs in the resonator cavity. Selection between the LNA out-put signal and signal coming direct from the antenna filter is made by a changeover switch (SW). The noise figure of the receiver front stage (220) will improve as the series switch on the signal path, which most degrades the noise figure, is removed between the filter and LNA, and isolation on the LNA bypass path increases.

REFERENCES:
patent: 6724278 (2004-04-01), Smith
patent: WO 99/29047 (1999-06-01), None
patent: WO 02/13402 (2002-02-01), None
patent: WO 02/47251 (2002-06-01), None

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