Fully differential differential amplifier with a high input impedance

摘要

The invention relates to a circuit with an input voltage (vin) and an output voltage (vout), which is a fully differential differential amplifier (fdda) with two differential input pairs (3, 4; 3 ', 4') and a differential output pair (5, 5 ') comprises. A plurality of resistors (r3,.., r7, r3 ',.., r7') is connected between the output pair (5, 5 ') and is connected in series via connecting node. By means of two reversing switches (s, s') is a respective input (3, 3 ') of an input pair can be connected to one of the connecting node.