ANALOG-TO-DIGITAL CONVERTING CIRCUIT WITH TEMPERATURE SENSING AND ELECTRONIC DEVICE THEREOF

摘要

The present invention relates to an analog-to-digital converting circuit with temperature sensing and the electronic device thereof. The present invention uses a first impedance device to receive a reference voltage and produces an input current according to a temperature. An analog-to-digital converting unit is coupled to the first impedance device and produces a digital output signal according to the input current. Thereby, according to the present invention, by integrating the first impedance device into the analog-to-digital converting circuit, the circuit area and the power consumption can be lowered, which further reduces the cost and improves the accuracy of temperature sensing.

主权项

1. An analog-to-digital converting circuit with temperature sensing, comprising:
a first impedance device, receiving a first reference voltage, and producing a current according a temperature; a first operational amplifier unit, having an input and an output, and said input coupled to said first impedance device; a second impedance device, having a first terminal and a second terminal, said first terminal of said second impedance device coupled to said input of said first operational amplifier unit, said second terminal of said second impedance device receiving a second reference voltage or a third reference voltage; a first capacitor, having a first terminal and a second terminal, said first terminal of said first capacitor coupled to said input of said first operational amplifier unit and said first terminal of said second impedance device, and said second terminal of said first capacitor coupled to said output of said first operational amplifier unit; and an analog-to-digital converting unit, coupled to said first impedance device, and producing a digital output signal according to said current.