CIRCUIT TOPOLOGY WITH AN INPUT STAGE HAVING A WIDE DYNAMIC RANGE AND CONSTANT TRANSCONDUCTANCE, COMPENSATED BEFORE PROCESS, VOLTAGE AND TEMPERATURE VARIATIONS.

摘要

The present invention refers to an input stage for voltage amplifiers; which main characteristics are: a wide dynamic range at the inlet, a constant transconductance behavior and a robust performance regarding PVT variations. For obtaining a wide dynamic range at the inlet, complementary differential pairs are used; the behavior of the constant transconductance being obtained by a current cut emulation in the branches of the differential pairs, said interruption originates that only one type of differential pair be operated at the same time according to the level of voltage in the common mood of the input signal. Due to the aforementioned description, the total sum of transconductance will always correspond to that of a single pair; the transition region will not show any important peak. On the other hand, the circuit is functional even in nanometric technologies different from CMOS, such as the SOI technology, where it was correctly tested at a scale of 45 nanometers.