The patent's inventors are Morino, Koichi (Kanagawa, JP); Kashima, Yuki (Kanagawa, JP); Ito, Masatoshi (Kanagawa, JP);
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to a semiconductor circuit and a constant voltage regulator employing the same, and more particularly, to a semiconductor circuit for use in constant voltage regulation which can prevent variations in output voltage due to abrupt changes in input voltage, and a constant voltage regulator employing such a semiconductor circuit.
"Voltage regulators are employed in power supply circuitry which generates a regulated voltage from an input voltage to drive a load circuit that operates with constant power. In electronic applications, a voltage regulator is implemented in a single integrated circuit (IC), typically together with load circuitry, such as a microcontroller or other electronic components, to which electrical power is supplied from an external power source such as battery.
"FIG. 1 is a circuit diagram schematically illustrating a configuration of a known voltage regulator 101.
"As shown in FIG. 1, the voltage regulator 101 comprises a series regulator that converts an input voltage V111 supplied from a power supply terminal 111 to a regulated, constant output voltage V113 for output to an output terminal 113, consisting of a driver transistor M112, being a p-channel metal-oxide semiconductor (PMOS) device, having a source terminal thereof connected to the power supply terminal 111 and a drain terminal thereof connected to the output terminal 113; a pair of voltage divider resistors R111 and R112 connected in series between the output terminal 113 and a ground terminal 112 to form a feedback node therebetween; a reference voltage generator 116 connected between the input terminal 114 and the ground terminal 112; and a differential amplifier 115 having a non-inverting input thereof connected to the voltage divider node, an inverting input thereof connected to the reference voltage generator 116, and an output thereof connected to a gate terminal of the driver transistor M112, with a pair of power supply inputs thereof connected between the input terminal 114 and the ground terminal 112.
"Components of the voltage regulator 101 may be integrated into a single IC, with the input voltage V111 being input from an external power source connected to the power supply terminal 111, and the output voltage V113 output to a load circuit connected to the output terminal 113.
"During operation, the driver transistor M112 conducts an electric current therethrough according to a voltage applied to the gate terminal, so as to output a regulated output voltage V113 to the output terminal 113. The voltage divider resistors R111 and R112 generate a feedback voltage Vfb proportional to the output voltage V113 at the feedback node therebetween, whereas the reference voltage generator 116 generates a reference voltage Vref for comparison with the feedback voltage Vfb. The differential amplifier 115, receiving the feedback voltage Vfb at the non-inverting input and the reference voltage Vref at the inverting input, controls operation of the driver transistor M112 according to a result of comparison between the differential inputs Vfb and Vref, thereby regulating the output voltage V113 to a desired constant level.
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