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A high-speed CMOS dual-phase dynamic-pseudo NMOS ((DP)2) latch and its application in a dual-modulus prescaler

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3 Author(s)
Hongyan Yan ; QUALCOMM Inc., San Diego, CA, USA ; Biyani, M. ; O, K.K.

A high speed dual-phase dynamic-pseudo NMOS ((DP)2) latch using clocked pseudo-NMOS inverters is presented. Compared to the conventional D-latch, this circuit has a higher maximum operating frequency and consumes lower dynamic power at a given operating frequency. The latch has been demonstrated by utilizing it in the synchronous counter section of a dual-phase dual-modulus prescaler implemented in a 0.8 μm CMOS process. The maximum operating frequency for the prescaler at 3 V supply voltage is 1.3 GHz, while the power consumption is 9.7 mW. This power consumption is significantly lower than those of the previously reported prescalers implemented in 0.8 μm CMOS processes. The 9.7 mW power consumption at 1.3 GHz also compares favorably to the 24 mW power consumption of the 1.75 GHz prescaler using MOS current mode latches implemented in a 0.7 μm CMOS process. A 25% reduction of the maximum operating frequency for a ~60% reduction of the power consumption should be a useful tradeoff

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:34 ,  Issue: 10 )