The CHA2157-99F from United Monolithic Semiconductors is a RF Amplifier with Frequency 55 to 60 GHz, Small Signal Gain 8 to 12 dB pk-pk, Gain Flatness ±1 to 2 dB, Noise Figure 3.5 to 4.5 dB, Output Power 13 to 15 dBm. Tags: Low Noise Amplifier. More details for CHA2157-99F can be seen below.