Patent ID: 9564805
Date: 2017-02-07
CPC Classifications: G05F,H02M

Claim:
1. A voltage generating circuit comprising: a current generating section that generates a current obtained by adding a current based on a voltage difference between base-emitter voltages of two bipolar transistors having different emitter areas and a current based on a forward voltage of a PN junction, and an output section that converts an input current into a voltage and outputs the converted voltage, wherein the current generating section includes: a first bipolar transistor that includes an emitter terminal connected to a first node, a base terminal connected to a second node, and a first collector terminal; a second bipolar transistor that has an emitter area larger than an emitter area of the first bipolar transistor, and includes an emitter terminal connected to the first node, a base terminal connected to the first collector terminal of the first bipolar transistor and a second collector terminal; a first resistance element that is connected to the first collector terminal of the first bipolar transistor at one end thereof and is connected to the second node at the other end thereof; a second resistance element that is connected to the second collector terminal of the second bipolar transistor at one end thereof and is connected to the second node at the other end thereof; a third resistance element that is connected to the second node at one end thereof and is connected to a first electric potential node at the other end thereof; an amplifier that receives, as inputs, a voltage on the first collector terminal of the first bipolar transistor and a voltage on the second collector terminal of the second bipolar transistor and outputs a voltage based on a voltage difference between the two input voltages; and a voltage-current converting section that receives, as an input, the output voltage of the amplifier, converts the received voltage into currents and supplies the converted currents to the second node and to the output section, wherein the output section includes a fourth resistance element which is supplied one of the converted currents and outputs the converted voltage based on the one of the converted currents, and wherein a resistance value of the third resistance element is larger than a resistance value of the fourth resistance element.