|A CMOS neuron with 130-nm SiGe technology is presented in this paper to simulate the biological activities of synapses and neurons in human brains. Biological neuron behaviors are introduced in the beginning then comes with its model. A device with name memristor is introduced to simulate synapse of the neuron. The circuit design can be separated into 3 stages: Dendrite input stage, LIF (leaky integrate and fire) stage, synapse stage. The first stage is achieved by a V-I converter and an Axon-Hillock circuit is implemented to simulate LIF stage, the synapse stage is modeled by resistor-memristor voltage divider based on STDP rule. The features of the whole neuron are based on the studies from neuroscience and mimicked by utilizing digital and analog circuits. The purpose of this paper is to give building blocks for future neural network applications.