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Low-power programmable divider with a shared counter for frequency synthesiser

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4 Author(s)
Kim, K.-Y. ; Sch. of Electr. Eng., Korea Univ., Seoul, South Korea ; Min, Y.-J. ; Kim, S.-W. ; Park, J.

A low-power programmable divider (PD) for frequency synthesiser is presented in this study. Instead of two counters used in conventional PD, a shared counter with a small control circuit is exploited in order to reduce the output load capacitance and the redundant counter operations in the divider. A novel glitchless D flip-flop is also proposed by considering the switching activities of the internal nodes of the flip-flop. The authors' proposed PD was fabricated in a standard 0.18-μm complementary metal-oxide-semiconductor (CMOS) technology. The average power is 3.23 mW with 1.5 V supply voltage and the effective area is 0.0408 mm2. Its division ratio ranges from 13 to 1278 at 3.5 GHz. Experimental results show that the proposed divider consumes around 30 less power compared to the conventional design.

Published in:

Circuits, Devices & Systems, IET  (Volume:5 ,  Issue: 3 )