A 5.4-GHz 2/3/4-Modulus Fractional Frequency Divider Circuit in 28-nm CMOS

Abstract

This paper describes the design and post-layout simulations of a 2/3/4-modulus frequency divider circuit, accompanied with an accumulator that controls the division count. The circuit is capable of operating as an integer or as a fractional divider. Key topic of this paper is the merging of div-2/3 and div-3/4 circuits into a single compact circuit that solves an issue of a forbidden state in fractional-division operation. The circuit is designed with 28-nm CMOS technology and the post-layout simulations indicate an operating input frequency range of 0.3 -5.4 GHz with 13-bit fractional frequency resolution between division ratios of 2-4. The divider occupies only 40 µm x 30 µm while consuming 2.0 mW at 5.4 GHz input frequency.

Microwave Frequency Dividers With Reconfigurable Fractional 2/N and 3/N Division Ratios

“…Non-integer frequency dividers are required in wireless communications especially for multifunction or multiservice applications [13]. They are also employed in a frequency synthesizer to improve the frequency range and resolution of the generated signal [14]. Frequency dividers with a non-integer frequency division ratio can be realised by using the combination of frequency dividers and multipliers.…”