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Very-high-speed Si bipolar static frequency dividers with new T-type flip-flops

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5 Author(s)
K. Ishii ; NTT LSI Labs., Kanagawa, Japan ; H. Ichino ; M. Togashi ; Y. Kobayashi
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This paper presents two circuit techniques for highspeed operation of a master-slave toggle flip-flop circuit (MSTFF). One circuit reduces the gain in latching circuits, and the other uses the transient current of the emitter followers to boost the switching speed. Both the SPICE simulations and the measured results for static 1/8 frequency dividers fabricated using 0.5-μm super self-aligned process technology (SSTIC) show that the maximum operating speed of our MS-TFF's is 10% and 30% faster than that of conventional ones. By applying these technologies, 19.1-GHz and 22.4-GHz Si bipolar static frequency dividers have been fabricated

Published in:

IEEE Journal of Solid-State Circuits  (Volume:30 ,  Issue: 1 )