Reference Potential Converter Circuit
AssigneeInterchip Corporation
InventorMasaaki Kamiya
Life of this patent
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Abstract
A reference potential converter circuit comprises: a first resistor (resistance value R1) serving as a feedback resistor for an operational amplifier; a second resistor (resistance value R2) connected to the first resistor and a reference voltage; and a third resistor (reference value R3) and a fourth resistor (reference value R4) connected between a power supply and ground. A difference voltage between Vout and Vref is divided by an R1/R2 ratio and applied to an inverting input terminal of the operational amplifier. A power supply voltage is divided by an R3/R4 ratio and applied to a non-inverting input terminal of the operational amplifier. The R1/R2 ratio and the R3/R4 ratio are equal.
Claims2
A reference potential converter circuit, comprising:
- a first resistor connected to an output and an inverting input of an operational amplifier which worked as a feedback resistor, and a second resistor connected to the inverting input of the operational amplifier and a reference voltage terminal;
- and
- a third resistor and a fourth resistor connected to each other in series and connected between a power supply and ground,
- wherein a point of connection between the third resistor and the fourth resistor is connected to a non-inverting input terminal of the operational amplifier;
- a ratio between a resistance value of the first resistor and a resistance value of the second resistor, and a ratio between a resistance value of the third resistor and a resistance value of the fourth resistor are equal to each other;
- and
- the reference voltage is obtained by a bandgap reference circuit.
Dependencies are inferred from the claim text.