The CHA4105-QDG from United Monolithic Semiconductors is a RF Amplifier with Frequency 2 to 4 GHz, Gain 23 dB, Noise Figure 5 dB, Output Power 24 dBm, Output Power 0.25 W. Tags: Surface Mount, Power Amplifier, Driver Amplifier. More details for CHA4105-QDG can be seen below.