| 摘要 |
A low power supply band-gap current reference includes a 1<st >P-N junction device, a 2<nd >and P-N junction device, a 1<st >current source, a 2<nd >current source, a 1<st >resistor, a 2<nd >resistor, a 3<rd >resistor, an operational amplifier, and a current mirror. The 1<st >and 2<nd >P-N junction devices are operably coupled to the 1<st >and 2<nd >current sources, respectively. The 2<nd >P-N junction device is a larger device than the 1<st >P-N junction device. The 2<nd >resistor is operably coupled in parallel with the 1<st >P-N junction device and the 2<nd >resistor is coupled in series with the 2<nd >P-N junction device. The 3<rd >resistor is coupled in parallel with the series combination of the 2<nd >resistor and 2<nd >P-N junction device. The operational amplifier is coupled to control the 1<st >and 2<nd >current sources based on the voltage imposed across the 1<st >and 2<nd >resistors. The current mirror is operably coupled to mirror the current of the 1<st >and/or 2<nd >current source to provide a band-gap reference current.
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