Abstract
The ÷ 3 and ÷ 5 regenerative frequency dividers (RFDs) with ultra-wide locking ranges are presented. The proposed dividers were fabricated by a TSMC 90 nm CMOS process, using ÷ 2 and ÷ 4 quadrature-injected current-mode-logic loop dividers to widen the locking ranges. The dividers also achieved quadrature input and quadrature output. Using a 1.2 V supply voltage, the power consumptions of the ÷ 3 and the ÷ 5 divider cores were 10.2 and 14.8 mW, respectively. Without using the tuning techniques, the measured locking ranges for the ÷ 3 and the ÷ 5 dividers were from 9 to 14.7 GHz (48.1%) and 7.2 to 19 GHz (90.1%), respectively. The phase deviation of the quadrature outputs for the two dividers were less than 0.8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> and 1.1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> . Compared with the reported data, the outstanding figure-of-merit values of the proposed ÷ 3 and ÷ 5 RFDs can be observed.
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