A 15mW fully integrated I/Q synthesizer for bluetooth in 0.18 µm CMOS

A low-power fully integrated synthesizer for Bluetooth applications is presented. The circuit with quadrature output and 15 mW power dissipation has been designed in a 0.18 µm CMOS process with 1.8 V supply voltage. The only external component is a 64 MHz X-tal. Measurements have been performed on packaged samples mounted on a FR-4 board and show that the B luetooth requirements are met. The measured phase noise is below -120dBc/Hz at 3 MHz offset and the resulting residual FM is 4.5 kHz.