| Citation: |
Zeng Longyue, Zhu Siqi, Yan Yuepeng. A Novel 4/5 Prescaler with Automatic Power Down[J]. Journal of Semiconductors, 2008, 29(8): 1449-1452.
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Zeng L Y, Zhu S Q, Yan Y P. A Novel 4/5 Prescaler with Automatic Power Down[J]. J. Semicond., 2008, 29(8): 1449.
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A Novel 4/5 Prescaler with Automatic Power Down
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Abstract
An "automatic power down" method is introduced to design a 4/5 prescaler,with the characteristic of making one of its D-flip-flops power down when it operates in divide-by-4 mode.Implemented with the TSMC 0.25μm mixed-signal CMOS process,the 4/5 MOS current mode logic prescaler is designed with this automatic power down technique.The simulation results show that the new 4/5 prescaler is immune to the "wake-up" issue and thereby retains the same maximum operating frequency as the conventional prescaler.An integer-N divider with this proposed prescaler and with the division ratio 66/67 is manufactured,and it is estimated to save more than 20% of the power compared with the conventional 4/5 prescaler.-
Keywords:
- MCML prescaler,
- automatic power down,
- frequency synthesizer
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References
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Proportional views
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