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A low power IC of the wireless monitoring system of the orthopedic implants (WMSoOI) is put forth. The analog-digital mix-mode system monitors the implant duty cycle, detects abnormal asymmetry, wear, and high amounts of force, and other conditions of the orthopedic implants. Data for diagnosis is communicated wirelessly between the embedded chip (inside body) and the remote circuit (outside body). The radio frequency (RF) circuits have been taped out and tested. The power circuit is presented and verified by simulation. Future work includes the test of circuits of analog digital converter (ADC) and micro control unit (MCU) and the integrating of the entire system.