US 12,332,671 B2
Startup circuit and bandgap circuit
Jia-Wun Syu, Taichung (TW)
Assigned to NANYA TECHNOLOGY CORPORATION, New Taipei (TW)
Filed by NANYA TECHNOLOGY CORPORATION, New Taipei (TW)
Filed on Mar. 27, 2023, as Appl. No. 18/190,121.
Prior Publication US 2024/0329675 A1, Oct. 3, 2024
Int. Cl. G05F 1/46 (2006.01); G05F 1/575 (2006.01)
CPC G05F 1/468 (2013.01) [G05F 1/461 (2013.01); G05F 1/575 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A startup circuit utilized for a bandgap circuit, the startup circuit comprising:
a start referencing circuit configured to receive an enabling signal ramping from a disabled voltage level to an enabled voltage level to generate a reference signal; and
a driving circuit having an input end coupled to the start referencing circuit and an output end coupled to an operational amplifier (Opamp) circuit of the bandgap circuit, the driving circuit being configured to generate a driving signal to the Opamp circuit according to the reference signal, the driving circuit comprising a plurality of buffer circuits coupled in series and at least one of the buffer circuits being a hysteresis buffer.