Fig.3a shows the waveforms of I1 and I2 in the circuit of
Fig 1b. Here Q2 and Q2 are the same type of MOSFET not
bipolar transistors, n1 and n2 keep exactly symmetrical. It is
shown in Fig3 that there isn't an evident difference between
the waveforms of I1 and I2, Uc1 and Uc2 are found to be equal.