questions about Delay Chain

[yibai]

as we know, Turnable Delay Chain has initial delay , and pricision of delay step.
i want to know, except inverter pair, buffer. there are other method to improve the delay chain's intial delay and step pricision?

3ks.

 

[nine8]

you can use "delay cell" whose W/H is less than one.

 

[AdvaRes]

a simple RC circuit can be used to intriduce delay.

 

[yibai]

you can use "delay cell" whose W/H is less than one.

what "W/H" mean? INVERTER, NAND, BUFFER are the fast cells. but Inverter pair has large initial delay, because of mux. NAND pair has large step delay...

i need a new structure...

Added after 34 seconds:

a simple RC circuit can be used to intriduce delay.

oh, RC of coz can do that ,but i need digital method...

 

[azerm]

in major digital std cell libs, there is some delay cell like DLYxx. look into the std cell list.

 

[yibai]

yes, but it's cell delay larger than NAND and Inverter. it seems no way to satisify me. en.
what your std cell delay of smic or tsmc 110 ns process. or 90 ns...

mine:
for example NAND2X1 about 0.03ns cell rising and falling