Voltage generating apparatus, current generating apparatus, and test apparatus
View Patent ↗There is provided a voltage generating apparatus that outputs a power source voltage from a voltage outputting terminal. The apparatus includes a voltage outputting section that outputs the power source voltage according to a current or voltage to be input, a first differential amplification section that compares the power source voltage and a preset first reference voltage to output a first control current or voltage reducing the power source voltage output from the voltage outputting section when the power source voltage is larger than the first reference voltage and output the first control current or voltage raising the power source voltage output from the voltage outputting section when the power source voltage is smaller than the first reference voltage, a current detector that detects a detecting voltage according to a power source current output from the voltage outputting terminal, a second differential amplification section that compares the detecting voltage detected from the current detector and a second reference voltage to output a second control current or voltage reducing the power source voltage when a value obtained by subtracting the second reference voltage from the detecting voltage is larger, an addition section that inputs a current or voltage obtained by adding the first control current or voltage and the second control current or voltage into the voltage outputting section, and a third differential amplification section that supplies a voltage obtained by amplifying a difference voltage obtained by subtracting the detecting voltage from a preset third reference voltage to the second differential amplification section as the second reference voltage.
1. A current generating apparatus that outputs a power source current from a current outputting terminal, comprising:
a current outputting section that outputs the power source current according to a current or voltage to be input;
a current detector that detects a detecting voltage according to the power source current output from the current outputting terminal;
a fourth differential amplification section that compares the detecting voltage and a fourth reference voltage according to a preset first reference current to output a first control current or voltage reducing the power source current output from said current outputting section when the power source current is larger than the first reference current and output the first control current or voltage raising the power source current output from said current outputting section when the power source current is smaller than the first reference current;
a fifth differential amplification section that compares a power source voltage at the current outputting terminal and a fifth reference voltage to output a second control current or voltage reducing the power source current when a value obtained by subtracting the fifth reference voltage from the power source voltage is larger;
an addition section that inputs a current or voltage obtained by adding the first control current or voltage and the second control current or voltage into said current outputting section; and
a sixth differential amplification section that supplies a voltage obtained by amplifying a difference voltage obtained by subtracting the power source voltage from a preset sixth reference voltage to said fifth differential amplification section as the fifth reference voltage.
2. The current generating apparatus as claimed in claim 1 , wherein said current detector comprises:
a series resistor that is provided on electric wiring between an output of said current outputting section and the current outputting terminal; and
a differential amplifier that detects the power source current by outputting a detecting voltage according to a potential difference between both ends of the series resistor.
3. The current generating apparatus as claimed in claim 1 , wherein said sixth differential amplification section reduces an amplification degree in a high-frequency area and increases an amplification degree in a low-frequency area.