CMOS D Flip Flop

[Ranjith]

Hello Everyone,

This question is wrt CMOS. I am building a D flip flop in 0.35 micron
technology in B2SPICE.

I wanted to know WHY D flip flop built using Transmission gate is
better than those using Nand Gates?

Is it just because the transmission gate transfers both logic 0 and 1,
efficiently? or there is something more than that?

Regards,
ranair123
student

 

[Jim Thompson]

On 25 Mar 2004 11:39:24 -0800, ranair123@softhome.net (Ranjith) wrote:

Hello Everyone,

This question is wrt CMOS. I am building a D flip flop in 0.35 micron
technology in B2SPICE.

I wanted to know WHY D flip flop built using Transmission gate is
better than those using Nand Gates?

Is it just because the transmission gate transfers both logic 0 and 1,
efficiently? or there is something more than that?

Regards,
ranair123
student

What is the definition of "better". My experience is that all-gate
versions perform better with sloppy clock edges.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.
WE MUST NOT LET THE LATTER PREVAIL IN THE NEXT ELECTION!

 

[MikeM]

Ranjith wrote:

Hello Everyone,

This question is wrt CMOS. I am building a D flip flop in 0.35 micron
technology in B2SPICE.

I wanted to know WHY D flip flop built using Transmission gate is
better than those using Nand Gates?

faster, smaller number of transistors

 

[John Larkin]

On Thu, 25 Mar 2004 13:45:16 -0700, MikeM <trashcan@yahoo.com> wrote:

Ranjith wrote:
Hello Everyone,

This question is wrt CMOS. I am building a D flip flop in 0.35 micron
technology in B2SPICE.

I wanted to know WHY D flip flop built using Transmission gate is
better than those using Nand Gates?

faster, smaller number of transistors

I'd guess better metastability performance, too.

John