A frequency divider is provided which uses common circuitry to switch between different duty cycle outputs. The divider has one or more memory elements with a feedback loop and which are controllable to adjust a duty cycle of an output signal. Each memory element has a first regenerative cell and a second regenerative cell, and where one of the regenerative cells is a controllable regenerative cell which can be controlled to vary the duty cycle of an output of the frequency divider circuit. The controllable regenerative cell can be selectively activated so that in a first configuration where the controllable regenerative cell is activated an output of the frequency divider circuit has a first duty cycle and in a second configuration where the controllable regenerative cell is deactivated an output of the frequency divider circuit has a second duty cycle.