Oscillator module and reference circuit thereof

摘要

A reference circuit for an oscillator module is provided. The reference circuit includes a reference voltage generation unit and a reference current generation unit. The reference voltage generation unit includes an electric element having a voltage proportional to absolute temperature (PTAT voltage) and provides a reference voltage based on the PTAT voltage. The reference current generation unit is coupled to the reference voltage generation unit and provides a reference current to the oscillator circuit to serve as an input current based on the PTAT voltage. The oscillator circuit generates a clock signal based on the reference voltage and the input current. The reference voltage and the input current are proportional to absolute temperature and have the same change trend relative to absolute temperature, such that the clock signal is a temperature insensitive signal. An oscillator module including an oscillator circuit and the foregoing reference circuit is also provided.