| 摘要 |
The device can be used in precision analogue-digital anddigital-analogue conveters, digital and analogue signalgenerators, voltage dividers, modulators and multipliers andeverywhere when high precicion and fast action voltage reswitchingis required. The device contains a digital logical diagram havingat least three logical elements or controllable outputs - onereswitchable (switch-type), one in static single position, and thethird one - in static neuter position, two units each for dynamicadjusting of the switchable level and its static adjustment andtwo operational amplifiers (OA) to the invetering inputs of whichsignals from the units for dynamic and static adjustment areconnected. The latter are compared to the reference levelssupplied to the OA non-inverting inputs and are adjusted by thedouble negative feed-back (NFB) in which they are included,together with the digital logical diagram by its supply from theOA outputs until the reference levels are equalized. The highprecision, the small temperature and time drift and the negligabledependence on the supply voltages and loading of the thus adjustedlevels which are being reswitched are the result of the precisionand stability of the reference levels and the inputcharacteristics of the two OAs and the structural adjustmentcircuit where two NFBs are simultaneously effected for each of thetwo adjusted levels: static, actuated by the signals of theelements of the digital logical diagram in static condition, andpulse-memorizing the signals of which are determining in theadjustment of the respective output level and are taken from thereswitchable output of the digital logical diagram.
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