Cell ratio (β ratio)

Beginner

How much stronger a memory cell’s grip on its 0 is than the door that connects it to the outside wire.

Novice

In a 6T SRAM cell, the strength (width) of a pull-down transistor divided by that of an access transistor. A larger ratio keeps the stored 0 from being pushed up during a read.

Expert

$\mathrm{CR} = (W/L)_{\mathrm{pd}} / (W/L)_{\mathrm{acc}}$ , commonly 1.5–2.5. It sets the read bump $V_{\mathrm{READ}}$ against the opposite inverter’s trip point, and so the read SNM.

Explained in Memory cells (Transistors).

All 896 terms →