The Implementation of Biotelemetry Chip by Analog Modulation Technique

With the progress of biotechnology wireless technique, the physiological parameters of patients should be monitored and recorded lively without interfering their routine activities. On the basis of this, the low power and easily integrated biotelemetry chip is present in this paper. Besides mixers for modulation needed, the PLL is adopted to make stable carrier in transmitter and lock the shifted phase in receiver, the sixth stage Gm-C BPF and second stage active RC LPF are adopted for channel selector and demodulation in receiver. The specifications of this biotelemetry are: 1) Modulation method: amplitude, 2) Operating frequency: 20 MHz ~ 100MHz 3) Biomedical signal potential sensitivity: 1 mV, 4) Signal input bandwidth: 100 kHz, 5. Power consumption in sensing part: 5 mW. The ECG and PH signals have been served as the input signal for the measurement of the system performance. The chips are fabricated in TSMC 0.35 mum 2P4M CMOS technology