TRANSCONDUCTANCE AMPLIFIER

A voltage divider comprising two identical resistors (R0) is arranged between the bases (3, 4) of two first transistors (T01, T02) arranged as a differential pair, each having a first emitter area (e0), the junction point of said resistors (R0) being connected to the base of a second transistor (T1) having a second emitter area (2e1), whose emitter, like that of the first transistors (T01, T02), is connected to a current source (6). For a ratio between the second and the first emitter areas (2e1; e0) equal to 4:1 the difference between the output currents (I1, I3) of the first transistors (T01, T02) increases as a linear function of the input voltage over an as large as possible range.