Transistor amplifying stage

摘要

Herein described is an amplifying stage comprising a first circuit part (1) and a second circuit part (2). The first circuit part (1) is positioned between a first (Vdd) and a second reference voltage and comprises at least a first transistor (Ma1....Man) having a first non-drivable terminal connected with current supplying means (Ibias) and at least a second transistor (Mt1) having a first non-drivable terminal connected with a second non-drivable terminal of the at least a first transistor (Ma1....Man); the current supplying means (Ibias) are connected to said first reference voltage (Vdd). The second circuit part (2) is connected by circuit to the first circuit part (1) and is fed by a current (It2) proportional to the current supplied by the current supplying means (Ibias). The second circuit part (2) has at least one input terminal and is connected to a load (LOAD). The first circuit part (1) comprises means (3) for connecting said first non-drivable terminal of the at least a first transistor (Ma1....Man) with the drivable terminal of the at least a second transistor (Mt1) and said connection means (3) are suitable for imposing the current that passes through said at least a second transistor (Mt1) to be the same as current (Ibias) supplied by said current supplying means and the voltage (Vp) between said first non-drivable terminal of the at least a first transistor (Ma1....Man) and ground is greater than the saturation voltage (Vds-sat) between the non-drivable terminals of said at least a first transistor (Ma1....Man). At the drivable terminal of the at least a first transistor (Ma1....Man) and at the at least one input terminal of the second circuit part (2) the same at least one input signal (Vin1....Vinn). <IMAGE>