Patent ID: 9739669
Date: 2017-08-22
CPC Classifications: G01K

Claim:
1. A circuit arrangement for measuring a temperature and producing a voltage representative thereof, comprising: first and second voltage-to-current converters each having a single voltage input, a current adjust input and a current output; a first operational amplifier having first and second inputs and an output; a first programmable resistor coupled to the current adjust input of the first voltage-to-current converter, wherein the first resistor adjusts a value of a first current from the current output thereof; a second programmable resistor coupled to the current adjust input of the second voltage-to-current converter, wherein the second resistor adjusts a value of a second current from the current output thereof; a third resistor coupled between the output and the second input of the first operational amplifier; the outputs of the first and second voltage-to-current converters and the second input of the first operational amplifier are coupled together; a first reference voltage coupled to the voltage input of the first voltage-to-current converter; a second reference voltage coupled to the voltage input of the second voltage-to-current converter; a third reference voltage provided by a digital to analog converter (DAC), wherein the third reference voltage is coupled to the first input of the operational amplifier; wherein a third current through the third resistor is equal to the second current minus the first current.