Low power injection locked oscillators for MICS standard

This paper presents two low power injection locked oscillators (ILOs): direct ILO and tail ILO, implemented in a standard 0.13-¿m CMOS process. Both ILOs are based on current-reuse differential LC voltage controlled oscillator (VCO) with different injection locations: direct injection for direct ILO and current source injection for tail ILO. The current-reuse topology enables lower power dissipation of both ILOs. It is about 1.2 mW (without output buffers) under supply voltage of 1.2-V. When the injected input signal power is 0 dBm, direct ILO and tail ILO feature a wide locking range of 320 MHz and 220 MHz, respectively. The locking range covers the Medical Implantable Communications Service (MICS) band (402 MHz-405 MHz). Each of the proposed ILOs can be used as the driver stage of power amplifier in transmitter systems conforming to the MICS standard.