No linear feedback amplifier circuit a

  
By the differential input stage, a differential voltage amplification, a forced differential voltage amplification, slow punch amplified complementary push-pull amplifier outpu
No linear feedback amplifier circuit a - schematic

t bias circuit, distortion servo circuit and protection circuit. Figure 2-41 (a) for the input preamplifier stage. VTioi, VTloz composition FET differential input circuit. Due to the high input impedance FET input for the omitted input capacitance, a real DC amplifier circuit. Due to the low voltage FET, using a single low-voltage power supply ( 15 -8V), and the use of 9m high FET o Rcos, C102 is a phase compensation circuit, to prevent the stop rate is too high due to the input signal distortion. VTi, VT04 constitute a differential voltage amplifier stage, to get enough gain to drive to force a balanced differential amplifier stage, this level takes a larger operating current t about 4. SMAO VTios ~ VTios constitute very good performance to force balanced differential amplifier level. This circuit is a good solution to the electrical effect of changes in voltage of the differential circuit, and simple circuit design improves the circuit gain, fork reduces distortion. In VTios collector access, L07 constitute a common-emitter amplifier circuit group altogether, not only can improve the linearity, wide bandwidth the same time, due VTll07 of access makes this group a set level between zero equivalent capacitance, this greatly reduces the level of distortion. VT109, VTiio constituting a buffer amplifier stage, VDiot, VD102 constitutes its base bias circuit, the present stage to provide a bias current of about ImA o cII (J is the base bias stabilizing capacitor, which makes the collector current VT106 the AC component is bypassed, the bias voltage to maintain the output level constant, and the distortion correction circuit.




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