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Design >> RF Design >> Question about CML divider?
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Message started by hotraymanf on Jul 27^th, 2009, 10:47pm

Title: Question about CML divider?
Post by hotraymanf on Jul 27^th, 2009, 10:47pm

Why do people often size the sense and regenative pair of CML divider to be the same? :)

Title: Re: Question about CML divider?
Post by boa on Aug 3^rd, 2009, 9:04am

Sorry, I am not answering your question directly, but I remember I've read some time ago an IEEE paper with detalized analysis of CML divider (basically checking the self-oscillation frequency for different W/L sizing of input diff pair and latch with fixed bias current) and if my memory serves me right, the conclusion was that sizing them equally is NOT optimal.

If anyone remembers the title of the paper, please post it here, it would be useful to re-read it.. Or maybe if you have some free time - make a quick test and let us know te result :)

Title: Re: Question about CML divider?
Post by jlee on Aug 9^th, 2009, 5:49am

"Dynamics of high-frequency CMOS dividers", published in 2002.