Current reference circuit with voltage-to-current converter having auto-tuning function

摘要

A current reference circuit has a band gap voltage generating circuit, a voltage buffer, a voltage-to-current converting circuit and an auto-tuner. The band gap voltage generating circuit generates a band gap reference voltage. The voltage buffer generates a first bias voltage and a second bias voltage. The voltage-to-current converting circuit generates a source current in response to a tuning voltage. The auto-tuner generates the tuning voltage to maintain a transconductance. Thus, the current reference circuit may automatically adjust the transconductance, so that the current reference circuit may supply the source current that is stable against temperature and process variations.