Modular Extended Range Divider For Multi Band Phase Locked Loop

This paper proposes a modular extended range divider structure for multi-band phase locked loop. The design of the proposed 2/3 divider cell is such that the power consumption and chip area of the extended range divider and the conventional multi modulus divider are the same. The divider is designed in TSMC 65 nm CMOS using a 1.2 V supply and has been verified to work reliably across process, voltage, and temperature variation. The worst case current, rise time, and fall time at 2.5 GHz is 420 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mu \mathbf{A}, 12.2$</tex> ps, and 10.8 ps, respectively.