Amplifier I: The specifications and technological parameters are given in figure 01. The calculated design space for this set of specifications is shown in figure 02, the green lines represents the maximum allowable gain versus channel length for the specified technological parameters. The red curve shows the variation of the gain in terms of the channel length for fT= fTmax while the blue curve corresponds to fT= fTmin. The cyan line corresponds to the minimum value for the voltage gain. The yellow region represents the design space, i. e., the region for which the specs are met. By selecting a point, all its characteristics are displayed at the right side of the screen. Fig. 01. Specifications and technological parameters for Amplifier I. Fig. 02. Design space for the specifications of figure 01 Amplifier I - Amplifier II - Current Mirror - Tranconductor - CS Amplifier