A 6GHz 60mW BiCMOS PhaseLocked Loop with 2V Supply

The design of a 6 GHz fully monolithic phaselocked loop fabricated in a 1 µm, 20 GHz BiCMOS technology is described. The circuit lilcorporates a voltage-controlled oscillator that senses and combines the transitions in a ring oscillator to achieve a period equal to two ECL gate delays. A mixer topology is also used that exhibits full symmetry with respect to its inputs and operates with supply voltages as low as 1.5 V. Dissipating 60 mW from a 2 V supplyt the dreuit has a tracking range of 300 MHz, ail nos jitter of 3.1 ps and phase noise of -75 dBc/Hz at 1 kHz offset.