A 1.2V 5.14mW quadrature frequency synthesizer in 90nm CMOS technology for 2.4GHz ZigBee applications

A low-cost 1.2V 5.14mW phase-lock loop (PLL) quadrature frequency synthesizer compliant with the 2.4GHz ZigBee standard (IEEE 802.15.4) has been implemented in 90nm CMOS technology. In-phase and quadrature (I/Q) components exhibit a phase noise of −105.9dBc/Hz at 1MHz offset from the carrier. The PLL die area including decoupling capacitors and testing buffers is 209×422μm
²
.