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A portable digital DLL architecture for CMOS interface circuits

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12 Author(s)
Garlepp, B.W. ; Rambus Inc., Mountain View, CA, USA ; Donnelly, K.S. ; Jun Kim ; Chau, P.S.
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A digital DLL was developed which achieves infinite phase range and 40 ps worst-case phase resolution at 400 MHz. The architecture uses dual delay lines with an end-of-cycle detector, phase blenders, and duty cycle correctors. This more easily process-portable DLL achieves jitter performance comparable to a more complex analog DLL, when placed into identical high-speed interface circuits fabricated on the same die in a 0.4 /spl mu/m CMOS process.

Published in:

VLSI Circuits, 1998. Digest of Technical Papers. 1998 Symposium on

Date of Conference:

11-13 June 1998