`
`What is claimed is:
`
`1.
`
`A voltage supply circuit comprising:
`
`a reference voltage generating circuit operable to generate a
`
`predetermined reference voltage;
`
`an operational amplifier circuit operable to generate an output
`
`voltage on the basis of said reference voltage;
`
`a selection circuit having at least two first terminals and controlled
`
`on the basis of a control signal from a control section to select one of said
`
`10
`
`first terminals and to generate a passed output voltage representing said
`
`output voltage passed through said first terminal selected;
`
`a second terminal operable to receive said passed output voltage
`
`and capable of outputting said passed output voltage to a load circuit; and
`
`a detection circuit operable to detect a magnitude of said passed
`
`15
`
`‘ output voltage and to generate a detection voltage, wherein
`
`said selection circuit is controlled on the basis of said control signal,
`
`selects a voltage corresponding to said passed output voltage generated
`
`from among at
`
`least
`
`two of said detection voltages and generates a
`
`selected detection voltage representing said detection voltage selected,
`
`20
`
`and
`
`said operational amplifier circuit decreases the difference between
`
`said reference voltage and said selected detection voltage.
`
`2.
`
`The voltage supply circuit according to claim 1, wherein
`
`25
`
`said selection circuit generates a plurality of passed output voltages,
`
`said second terminal does not receive one predetermined voltage of
`
`said plurality of passed output voltages.
`
`
`
`29
`
`3.
`
`The voltage supply circuit according to claim 2, wherein said
`
`detection circuit uses said predetermined passed output voltage as said
`
`detection voltage.
`
`4.
`
`The voltage supply circuit according to claim 1, wherein said
`
`detection circuit performs detection by dividing said passed output voltage.
`
`5.
`
`The voltage supply circuit according to claim 4, wherein said
`
`detection circuit includes two resistors connected in series with each other
`
`1O
`
`between said first terminal and a ground terminal and detects the voltage
`
`at the connection point of said two resistors.
`
`6.
`
`The voltage supply circuit according to claim 1, further comprising a
`
`buffer circuit that receives said passed output voltage at a high impedance
`
`15
`
`and outputs said passed output voltage at a low impedance, wherein
`
`said second terminal receives said passed output voltage through
`
`said buffer circuit.
`
`7.
`
`The voltage supply circuit according to claim 6, wherein said
`
`20
`
`detection circuit detects the magnitude of said passed output voltage
`
`received through said buffer circuit.
`
`8.
`
`The voltage supply circuit according to claim 6, wherein
`
`said buffer circuit includes a transistor,
`
`25
`
`said transistor receives said passed output voltage at a control
`
`terminal of said transistor and outputs the received voltage from ether one
`
`of a source terminal or an emitter terminal of said transistor.
`
`
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