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## High Swing Bias

A high swing bias scheme for a cascode transistor is shown in Figure 1.

**Assumptions**

- Transistors M1-M5 are in saturation and Mx1-Mxn are in triode region
- Square law model of MOST is considered for analysis

Consider the general case where M3 and M4 have different aspect ratios. But M3 & Mx and M4 & M5 have same aspect ratios hence same . In such a case from square law model the channel current is given by,

(1)

From Eq.1,

(2)

If M4 and M5 are matched, and .

From Eq.2

(3)

Substituting Eq.3 in Eq.1, we get

(4)

Solving for , we get,

where

- Mx1-Mxn devices replace quarter-size device
- Less sensitive to body effect[?][?]