Animal model is a sort of common method for drug development

drug efficacy evaluation and pathological study.Implantable wireless system is a common tool for physiological parameters monitoring of animals.Focus on the key problems of small animal monitoring system

analog circuit is designed to realize PPM modulation and transmitting module is designed as time division multiplex access（TDMA）mode

which reduces the size and power consumption of the implantable module.AM radio receiver ZN414Z and C8051F040 micro-processor are used in the design of the receiving module

which complete signal demodulation

signal processing and transmission and display on PC.The power consumption of the implantable module that includes a channel of ECG and a channel of temperature is only 60 μA.Continuous working time is up for 78d when using two RENATA395 as power.The experiments on simulative ECG signal and SD rat show that the system can get stable ECG signal.Small size makes the system to have a great advantage in the monitoring of small animals.