Electronic circuit, semiconductor device, electronic equipment, and timepiece

An electronic circuit having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage and a comparison voltage having a predetermined relationship with said constant voltage;
• wherein said second voltage creation circuit comprises:
• a differential amplifier for amplifying the difference between said reference voltage and said comparison voltage;
• a constant-current source for supplying a constant current;
• a circuit having a voltage-control transistor to which said constant current is supplied;
• and
• an output transistor which is connected in series with said circuit having said voltage-control transistor to be supplied with said constant current, the resistance of said output transistor being controlled by an output of said differential amplifier;
• wherein said comparison voltage is output from one end of said circuit having said voltage-control transistor, using a predetermined potential as reference, while said constant voltage being output from another end of said circuit having said voltage-control transistor;
• and
• wherein said constant current is set to a value within a saturated operating region of said voltage-control transistor.

An electronic circuit having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage to have a predetermined relationship with said reference voltage;
• wherein said first voltage creation circuit comprises a first constant-current source for supplying a constant current, and a circuit having a first voltage-control transistor through which said constant current is passed and which outputs said reference voltage with reference to a predetermined potential;
• and
• wherein said constant current is set to a value within a saturated operating region of said first voltage-control transistor, and said first voltage-control transistor is selected from a plurality of transistors having mutually different current amplification ratios.

An electronic circuit having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage and a comparison voltage having a predetermined relationship with said constant voltage;
• wherein said second voltage creation circuit comprises:
• a differential amplifier for amplifying the difference between said reference voltage and said comparison voltage;
• a constant-current source for supplying a constant current;
• a circuit having a voltage-control transistor to which said constant current is supplied;
• and
• an output which is connected in series with said circuit having said voltage-control transistor to be supplied with said constant current, the resistance of said output transistor being controlled by an output of said differential amplifier;
• wherein said comparison voltage and said constant voltage are output with reference to a predetermined potential from one end and another end of said circuit having said voltage-control transistor;
• and
• wherein said voltage-control transistor is selected from a plurality of transistors having mutually different current amplification ratios.

An electronic equipment having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage to have a predetermined relationship with said reference voltage;
• wherein said first voltage creation circuit comprises a first constant-current source for supplying a constant current, and a circuit having a first voltage-control transistor through which said constant current is passed and which outputs said reference voltage with reference to a predetermined potential;
• and
• wherein said constant current is set to a value within a saturated operating region of said first voltage-control transistor.

An electronic equipment having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage and a comparison voltage having a predetermined relationship with said constant voltage;
• wherein said second voltage creation circuit comprises:
• a differential amplifier for amplifying the difference between said reference voltage and said comparison voltage;
• a constant-current source for supplying a constant current;
• a circuit having a voltage-control transistor to which said constant current is supplied;
• and
• an output transistor which is connected in series with said circuit having said voltage-control transistor to be supplied with said constant current, the resistance of said output transistor being controlled by an output of said differential amplifier;
• wherein said comparison voltage is output from one end of said circuit having said voltage-control transistor, using a predetermined potential as reference, while said constant voltage being output from another end of said circuit having said voltage-control transistor;
• and
• wherein said constant current is set to a value within a saturated operating region of said voltage-control transistor.

An electronic equipment having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage to have a predetermined relationship with said reference voltage;
• wherein said first voltage creation circuit comprises a first constant-current source for supplying a constant current, and a circuit having a first voltage-control transistor through which said constant current is passed and which outputs said reference voltage with reference to a predetermined potential;
• and
• wherein said constant current is set to a value within a saturated operating region of said first voltage-control transistor, and said first voltage-control transistor is selected from a plurality of transistors having mutually different current amplification ratios.

An electronic equipment having a constant-voltage generation circuit for creating a constant voltage,

• wherein said constant-voltage generation circuit comprises a first voltage creation circuit for creating a reference voltage, and a second voltage creation circuit for creating said constant voltage and a comparison voltage having a predetermined relationship with said constant voltage;
• wherein said second voltage creation circuit comprises:
• a differential amplifier for amplifying the difference between said reference voltage and said comparison voltage;
• a constant-current source for supplying a constant current;
• a circuit having a voltage-control transistor to which said constant current is supplied;
• and
• an output which is connected in series with said circuit having said voltage-control transistor to be supplied with said constant current, the resistance of said output transistor being controlled by an output of said differential amplifier;
• wherein said comparison voltage and said constant voltage are output with reference to a predetermined potential from one end and another end of said circuit having said voltage-control transistor;
• and
• wherein said voltage-control transistor is selected from a plurality of transistors having mutually different current amplification ratios.