Patent ID: 7221967

Claim:
A cell phone booster which is constructed to connect to a cell phone and to an antenna and which can boost a cell phone output signal that is generated by the cell phone for transmission by the antenna, wherein the booster includes a control that detects the strength of the cell phone output signal and that selects a level of amplification of the cell phone output signal that is delivered to the antenna, comprising: an amplifier which has an input coupled to said cell phone output, and which has an amplifier output, said amplifier having a constant gain which is in a linear region of the amplifier; an attenuator apparatus which is connected in series with said amplifier and which is switchable between at least first and second discrete attenuation levels; a switch arrangement controlled by said control which selects one of said attenuation levels of said attenuator apparatus in response to the strength of said cell phone output signal.