The AS4221 from Teledyne Microwave Solutions is a RF Amplifier with Frequency 1 to 4.2 GHz, Small Signal Gain 11.5 to 13 dB pk-pk, Gain Flatness ±0.8 to ±1 dB, Noise Figure 1 to 2.3 dB, Output Power 12.5 to 14 dBm. Tags: Drop-In, Power Amplifier. More details for AS4221 can be seen below.