Reference voltage generators, integrated circuits, and methods for operating the reference voltage generators

摘要

A reference voltage generator is described. The reference voltage generator includes a proportional to absolute temperature (PTAT) current source, the PTAT current source being capable of providing a first current that is proportional to a temperature. The reference voltage generator further includes a current mirror comprising a first transistor and a second transistor, the current mirror configured to generate a second current proportional to the first current, wherein a ratio of the first current to the second current is equal to a ratio of a gate width of the first transistor to a gate width of the second transistor. The reference voltage generator further includes a voltage divider, the voltage divider being capable of receiving the second current, the voltage divider capable of outputting a reference voltage, the reference voltage being substantially independent from a change of the temperature.

主权项

1. A reference voltage generator comprising:
a proportional to absolute temperature (PTAT) current source, the PTAT current source being capable of providing a first current that is proportional to a temperature; a current mirror comprising a first transistor and a second transistor, the current mirror configured to generate a second current proportional to the first current, wherein a ratio of the first current to the second current is equal to a ratio of a gate width of the first transistor to a gate width of the second transistor; and a voltage divider, the voltage divider being capable of receiving the second current, the voltage divider capable of outputting a reference voltage, the reference voltage being substantially independent from a change of the temperature, wherein the voltage divider comprises a first diode-connected transistor and a second diode-connected transistor, and the reference voltage is capable of being adjusted based on width/length ratios of the first diode-connected transistor and the second diode-connected transistor, wherein the PTAT current source is further capable of providing a third current that is proportional to the first current.