| 摘要 |
A circuit that outputs a stable reference voltage with an operating supply voltage less than the band gap potential and also less than a zero-bias threshold voltage. In one embodiment, the sub-band gap circuit includes an operational amplifier having an N-well input stage operating in the sub-threshold region, and a proportional to absolute temperature (PTA) current source having a forward-biased P-bulk. In another embodiment, the operational amplifier realizes sub-one volt operation by making use of back gating as the input stage, allowing full rail-to-rail input and output swings.
|
