The VMMK-3503 from Broadcom is a RF Amplifier with Frequency 500 MHz to 18 GHz, Gain -11 to 12 dB, Noise Figure 3.5 to 4.2 dB, Output Power 9 dBm, Output Power 0.01 W. Tags: Surface Mount, Variable Gain Amplifier. More details for VMMK-3503 can be seen below.