The AST20S from ASB Inc. is a RF Amplifier with Frequency 900 MHz to 3.5 GHz, Gain 8.5 to 18 dB, Noise Figure 0.6 to 2.1 dB, Output Power 16 to 18.5 dBm, Output Power 0.04 to 0.07 W. Tags: Chip, Low Noise Amplifier. More details for AST20S can be seen below.