Optimal static work point and corresponding physical criteria for amplifier circuit
The static operating point(Q-point)is a key parameter for transistor amplification circuits to amplify signals without distortion.Currently,the graphical method is commonly used for posterior estimation of the Q point,lacking a theoretical basis for prior optimal design.To address this issue,this paper carefully examines the applicable boundary of the graphical method and provide a definition of the optimal Q point.This optimal Q point is characterized by maximizing margin product and expected voltage difference.More importantly,this paper derives the optimal Q-point mathematically,and clarifies the equivalence between the optimal Q-point and the maximum transmission power physically.In addition,in order to verify the generality of the optimal Q-point theory,this paper cleverly transforms the locating of the optimal Q-point for complex circuits into the examination of the relative changes allowed for several representative circuit parameters of simple circuits,which demonstrates the applicability of the optimal Q-point theory and its superiority in guiding the design of complex circuits.This research provides theoretical guidance for the optimal Q-point design of amplification circuits and fast analysis of circuit static parameters,which can be widely used in very large-scale integrated circuits,flexible smart metasurfaces,superconducting quantum topological circuits and many other new complex electronic information systems.
static work pointamplified circuitsmaximum transmission powercircuit parameters
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