So, with zero input current, both Q1 and Q3 conduct Ibias, as does Q2 and Q4 and the circuit acts with a differential output. Figure 3 LTspice simulation of differential output in response to small ...

An autotransformer is a transformer having part of its winding included in both the input and output circuit. A simple autotransformer connection is shown in Fig. 1. Note that because there is a ...