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Design >> Analog Design >> 65nm CMOS MAx Operating Frequency
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Message started by AnalogGR on Sep 11^th, 2009, 5:24am

Title: 65nm CMOS MAx Operating Frequency
Post by AnalogGR on Sep 11^th, 2009, 5:24am

Hi,

is any rule of thumb where you can get the max operating frequency and the max data rate of each process?

For example 0.25μm CMOS can operate at 2.5GHz or transfer data at 5Gbps

Regards

George Best

Title: Re: 65nm CMOS MAx Operating Frequency
Post by loose-electron on Sep 11^th, 2009, 4:47pm

Way too general a question - totally depends upon the nature of the specific circuit being designed, the driving and loading environment, etc.

Title: Re: 65nm CMOS MAx Operating Frequency
Post by raja.cedt on Sep 12^th, 2009, 6:45am

hi,
i feel it mainly depends on the ft of the technology.

Thanks,
Rajasekhar.

Title: Re: 65nm CMOS MAx Operating Frequency
Post by kidman on Sep 13^th, 2009, 1:32am

I agree with raja. Plot the ft of the technology. There's a rule of thumb that the max unity gain freq you can get out of a technology is ft/10.

Check the 3rd and 4th lecture in this link

http://bwrc.eecs.berkeley.edu/classes/icdesign/ee240_s09/

Title: Re: 65nm CMOS MAx Operating Frequency
Post by Berti on Sep 15^th, 2009, 2:44am

Generally ft is probably a good indicator, but in reality the maximum speed of your digital gates depends on their propagation delay which is e.g. a function of the threshold voltage.
Depending on the technologies process option a 65nm CMOS digital gate might therefore not be much faster than in 130nm (but lower leakage).

Regards

Title: Re: 65nm CMOS MAx Operating Frequency
Post by loose-electron on Sep 19^th, 2009, 4:11pm

minor detail - Ft is a great indication of the theoretical limitations of the transistor - and not much else - I dont know of any real world design that operates near the Ft of the transistor, and the GBW characteristics are going to be heavily dependent on the applications circuit and loading around it.