Device and method of operating the same

A device includes a sensor configured to provide a temperature-sensitive voltage and an oscillator. The sensor includes: a first transistor, being a diode-connected transistor; a second transistor coupled between a source of the first transistor and ground, wherein a gate of the second transistor is controllable by an enable signal; and a current source configured to control the first transistor and comprising a third transistor, a drain of which is directly connected to a drain of the first transistor, the third transistor being a diode-connected transistor. The oscillator includes: a digital delay cell; and an adjustment device configured to, based on the temperature-sensitive voltage, adjust a delay of the digital delay cell. The digital delay cell produces, based on the adjusted delay, a signal at an oscillation frequency.