Symmetric steady voltage circuit

Published:2011/4/13 22:37:00 Author:Nicole | Keyword: symmetric steady voltage | From:SeekIC

Adopting butted amplitude limiter circuit composed of regulator tube, if you want to have symmetry, it needs two regulator tubes with same performance, such as this oscilloscope circuit, but it is hard to achieve in practice. So we can connect regulator tubes to rectifier DC circuit(figure a), output voltage UA is the sum of two diodes forward voltage drop UD2, UD5 or UD4, UD3 and regulator tube work voltage UZ. That is, +UA=UD2+UZ+UD5 or - UA=UD3+UZ+UD4. To select regulator tube work voltage and work point appropriately, it also can achieve temperature compensation for output voltage. The figure (b) is large current amplitude limiter circuit. In the positive half cycle, the base-collector junction diode of transistor T1 is equal to diode D2 in figure(a), the base-emitter junction diode of T2 in series with diode D3 are equal to diode D5 in figure(a).



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