Abstract: A 2.4 GHz low noise full integrated RF (radio frequency) front end circuit is presented in this paper. The full integrated RF front end circuit is composing of LNA (low noise amplifier) and PA (power amplifier), it can receive and transmit RF signal. The proposed circuit is implemented in a 0.18um SiGe process. Based on the concept of circuit co-design, the match network of LNA and PA is co-designed on chip, there are only one input pad and one output pad. Simultaneously, two inductors short to ground is inserted into the match network which is used to offer ESD protection. The supply voltage of the circuit is 3.3 V, it consumes 5.1 mA in receive mode and 17 mA in transmit mode. In the receive mode, the proposed circuit exhibited a gain of 13.5 dB and the noise figure is 2.8 dB. While change to transmit mode, the proposed circuit achieves a power gain of 25.4 dB and the saturation output power is 24.3 dBm.