In this letter, a highly linear 1.22GHz current mirror based differential RF programmable gain amplifier (RFPGA) for digital TV tuner applications is proposed and implemented using 0.18-µm CMOS process. The fabricated RFPGA shows a maximum power gain of 9dB, an OIP3 of 23.5dBm, and an accurate dB-linear discrete gain step control while consuming 36mA from a 1.8-V supply voltage.