Abstract: A stabilized DC power supply circuit comprises an error amplifier circuit, an output amplifier circuit, an output voltage division circuit, and a reference voltage circuit. A bias current boost circuit capable of stabilized operation is added to the DC power supply circuit. Since the feedback loop of the bias current boost circuit is provided with a hysteresis function or an artificial hysteresis function by a large delay element, it is possible to adaptively control bias current without sacrifice of stability and realize a stabilized DC power supply circuit exhibiting high response and high stability with low current consumption.

Abstract: Adaptively controlled circuits are provided that can include an output buffer circuit, a sensing circuit, and a current conversion circuit. The output buffer circuit can include, for example, inputs, outputs and a bias control input. The sensing circuit can also include inputs and outputs. Two or more sensing circuit outputs can simultaneously turn to lower or higher level than a predetermined threshold level. The current conversion circuit can be composed of one or more set of cascaded transistors. Inputs of the cascaded transistors can be connected to outputs of the sensing circuit. The output of the cascaded transistors can be connected to foresaid bias control input of the output buffer. An output current of the current conversion circuit increases when signal level of the inputs of the sensing circuit become equal or close to each other.