Frequency‐to‐voltage converter based dual‐loop phase‐locked loop with variable phase locking capability

Abstract

Abstract A novel frequency‐to‐voltage converter based phase‐locked loop (PLL) is proposed to overcome the inability of a frequency‐to‐voltage converter based frequency‐locked loop to lock phase. The proposed dual‐loop PLL adds variable phase‐locking capability, such that the phase locking angle can vary from 0–360°. The additional variable phase‐locking can be applied in data communication in the form of phase modulation. The design is targeted for a 0.5‐μm CMOS process. The proposed design generates a 480 MHz clock from a reference clock of 15 MHz. In simulation, the proposed PLL locks within 3.56 μs while consuming 1.61 mW of power.

Keywords

• frequency convertors
• frequency locked loops
• frequency multipliers
• frequency synthesizers
• phase locked loops
• continuous phase modulation