Complementary differential fully symmetrical power amplifier 01

The white input stage uses a complementary differential circuit . On the one hand, it can give full play to the advantage of the differential circuit's high common-mode rejection ratio. At the same time, the use of complementary push-pull can reduce nonlinear distortion and increase the dynamic range. The emitters of the four differential tubes are respectively connected to negative feedback resistors , which can reduce the distortion of this stage. Transistors VT5 and VT6 are used for constant current. VT7 and VT8 form a driving stage. The emitter resistor also plays a role in stabilizing gain and improving linearity . 6. Capacitor C3.C4 can prevent high-frequency self- excitation.