III. Gm-C Filtering - Epublications - Université de Limoges

III.3.c Gm-cells with MGTR
III.3.c.i Filter Design
This Gm-cell, as it may be seen in Figure 129, drains 4.5mA from the 2.5V supply.
Figure 129. Gm-cell design
The dimensioning of the Gm-cell is described in Table 12. T0 drains 4 mA in the Gmcell
while 500µA is used for the common-mode feedback (CMFB). PDA bias is set further to
optimize the linearity of the Gm-cell.
Table 12. Gm-cell dimensioning
Transistor W/L (µm/µm)
T1 – T2
T3 – T4
- 109 -
32 / 0.28
100 / 0.28