Patent ID: 8786271

Claim:
A circuit for generating a reference voltage and a reference current, comprising: a band-gap reference circuit, configured to generate a temperature-independent reference voltage by generating a first current with a positive temperature coefficient; and a voltage-to-current converting circuit, coupled to a node of the band-gap reference circuit and configured to convert a voltage with a negative temperature coefficient at the node into a second current with a negative temperature coefficient; wherein the band-gap reference circuit and the voltage-to-current converting circuit share a common current source and the common current source has a feedback transistor through which a reference current flows; wherein the reference current is divided into the first current of the band-gap reference circuit and the second current of the voltage-to-current converting circuit, having a temperature coefficient substantially equal to zero by combining the first current and the second current; wherein the voltage-to-current converting circuit comprises: an operational amplifier, having a first input terminal coupled to the node of the band-gap reference circuit, a second input terminal and an output terminal; and a bias current source, coupled to the common current source and to the second input terminal and the output terminal of the operational amplifier, for generating the second current based on the voltage with the negative temperature coefficient at the node.