Wide-Locking Range Divide-by-4 Injection-Locked Frequency Divider Using Dual-Resonance RLC Resonator for Biomedical Sensor Applications

This paper presents a wide locking range divide-by-4 RLC injection-locked frequency divider (ILFD) implemented in the TSMC 0.18 μm 1P6M CMOS processs for biomedical application. The ILFD is based on a cross-coupled oscillator with two direct injection MOSFETs in series and a dual-resonance RLC resonator. The resistor is used to enhance the locking range. At the drain-source bias of 1.2 V, and at the incident power of 0 dBm the locking range of the divide-by-4 ILFD is 3.6 GHz, from the incident frequency 11.5 to 15.1 GHz, the locking range percentage is 27.07%. The power consumption of ILFD core is 9.12 mW. The die area is 0.858 × 0.722 mm2 for radio frequency linear position sensor.