Design of 30 MHz~512 MHz FSK/OOK Dual-mode RF Transmitter

A CMOS transmitter supporting On-Off Keying (OOK) and Frequency Shift Keying (FSK) modulation is proposed. The transmitter integrating 4th-order TypeⅡPhase-Locked Loop, a switched-mode PA and a built-in loop filter adopts a Replica_Bias_Loop technique to reduce charge pump reference spur, and achieves a 30 MHz-512 MHz frequency coverage by adjusting the configurable network frequency division ratio. FSK/OOK modulation is implemented by changing fractional frequency division ratio and switching power amplifier with process and temperature compensation on and off. Implemented in SMIC 0.18 μm1P4M process, the transmitter occupys an area of 1.05 mm*1.35 mm and the overall power consumption is 16 mW from a 1.8 V power supply.