A 1~3 GHz wideband low noise amplifier with high and tunable gain(HTG-LNA) was presented. At the input stage, a cascode current mirror structure with RC series negative feedback was used to achieve good input impedance matching and improve the stability. At the middle stage, a cascode Darlington amplifier with an active inductor as load was employed, which could provide high and tunable gain under the broadband operation. At the output stage, an emitter follower structure with a current mirror was used to provide high output power and to achieve good output impedance matching. Based on the standard WIN 0.2 μm GaAs HBT process, the proposed HTG-LNA was verified. The results showed that the HTG-LNA had a voltage gain of over 37 dB, a maximum voltage gain of 50.7 dB, a power gain of more than 37.4 dB, a maximum power gain of 51 dB, a maximum gain tuning range of 2.2 dB, an input return loss of less than -7.11 dB, an output return loss of less than -11.97 dB, a noise figure of less than 3.23 dB, and a stability factor of higher than 5.61. The static power consumption was less than 65 mW at 5 V supply voltage.