Patent ID: 9588539
Date: 2017-03-07
CPC Classifications: G05F

Claim:
1. A band-gap reference circuit based on temperature compensation, the circuit comprising: a proportioned current generating circuit configured to generate a current in direct proportion to the absolute temperature; a startup circuit configured to start up the proportioned current generating circuit when the startup circuit is power on, wherein the startup circuit comprises a first startup field effect transistor, a second startup field effect transistor, a third startup field effect transistor and a startup capacitor; a source of the first startup field effect transistor is configured to receive a direct current voltage; a drain of the first startup field effect transistor is electrically coupled to a gate of the second startup field effect transistor, a source of the third startup field effect transistor and an upper plate of the startup capacitor respectively; a source of the second startup field effect transistor is configured to receive the direct current voltage; a drain of the second startup field effect transistor acts as an output terminal of the startup circuit a drain of the third startup field effect transistor and a gate of the third startup field effect transistor are electrically coupled together and are grounded; and a lower plate of the startup capacitor is grounded; a current mirror circuit configured to reproduce a current which is the same as the current in direct proportion to the absolute temperature; a high-order temperature compensation generating circuit configured to generate a compensation current of high-order temperature coefficient; and a reference generating circuit configured to add the voltage which is generated by the proportioned current generating circuit to a voltage of negative temperature coefficient according to a certain proportion, and output a reference voltage of zero temperature coefficient.