Design of frequency synthesizer with VCO charged by near infrared for bioinformatics and healthcare wireless applications on robotic nurses

This paper presents a wide tuning, low phase noise, and fast locking CMOS frequency synthesizer with 1.8V power supply. The proposed design is operating frequency range of the proposed design is ranged for the local oscillator of the RF front-end circuits. The phase-locked loop (PLL) frequency synthesizer is implemented in TSMC 0.18 μm CMOS process. The main features include the uses of a gate-to-source feedback Colpitts voltage-controlled oscillator (VCO) to lower phase noise, and an off-chip tunable low-pass filter to compensate the variations of resistance R and capacitance C to speed locking time and reduce chip area. This chipset has built in near-infrared laser-driven (NIRLD) might be a promising wireless electrical power source technology with human body. This chip can sense ECG and EMG signal and wireless transfer to robotic nurses. The computational biology and bioinformatics sent to healthcare center or research hospital from robotic nurses in control intelligence.