Impedance transformation circuit - comprises asymmetric differential transconductance amplifier with two input and output circuits, which have cross-coupled load transistors

摘要

The circuit comprises an operational amplifier (OP) that includes a first and a second input circuit having respective input transistors (T1,T2) as well as a first and a second input load circuit (T6,T7). A first and a second output circuit comprises a respective output transistor (T4,T3) as well as a first and a second output load circuit (T9,T8). The control inputs of the first input load circuit and the second output load circuit, and the control inputs of the second input load circuit and the first output load circuit are interconnected. The outputs of the first input transistor and the first output transistor are fed back to their respective control inputs. The operational amplifier is pref. controlled by a variable current source.