Temperature sensor and image sensor having the same

摘要

A temperature sensor includes a band gap reference (BGR) circuit, a voltage generation unit and a digital CDS circuit. The band gap reference (BGR) circuit generates a reference voltage proportional to a temperature. The voltage generation unit generates a first voltage and a second voltage based on the reference voltage, where the first voltage and the second voltage are proportional to the temperature. The digital CDS circuit generates a digital signal corresponding to the temperature by performing a digital correlated double sampling (CDS) operation on the first voltage and the second voltage. The temperature sensor is able to detect a temperature accurately.

主权项

1. An image sensor, comprising:
a detection unit configured to generate a first analog signal corresponding to a reset component after reset, and configured to measure an intensity of incident light to generate a second analog signal corresponding to the measured intensity of incident light; a temperature sensing unit configured to generate a first voltage and a second voltage proportional to a temperature; an analog-digital conversion unit configured to generate a first digital signal corresponding to an effective intensity of incident light among the measured intensity of incident light by performing a digital CDS operation on the first analog signal and the second analog signal, and configured to generate a second digital signal corresponding to the temperature by performing a digital CDS operation on the first voltage and the second voltage; and a digital signal processor (DSP) configured to adjust the first digital signal based on the second digital signal, wherein the temperature sensing unit adjusts a magnitude of the first voltage and a magnitude of the second voltage in a same ratio based on a gain control signal.