The ERZ-HPA-0200-0400-40 from ERZIA is a RF Amplifier with Frequency 2 to 4 GHz, Small Signal Gain 29 to 32 dB, Gain Flatness ±2 dB, Noise Figure 13 dB, Output Power 39.7 to 41.5 dBm. Tags: Power Amplifier. More details for ERZ-HPA-0200-0400-40 can be seen below.