Integer-N charge pump phase locked loop for 2.4 GHz application with a novel design of phase frequency detector

Abstract

In this article, a novel design is presented, for an Integer-N charge pump phase locked loop (PLL). The design is with a resetless phase frequency detector, and with the differential design of charge pump. The voltage-controlled oscillator is of current starved type. The proposed PLL is not having any blind zone and is having near-zero dead zone. When compared to the conventional design, the current mismatch in the charge pump is reduced by 3.21%, and the lock time of the PLL is reduced by 79%. The PLL is intended for 2.4 GHz application, and the obtained lock time is 1.7 μs. The implementation is done with the three-stage ring oscillator, with divider of modulus as 24, in 180 nm TSMC technology. At 1.8 V supply voltage, the circuit consumes 9.72 mW of power.