A bandgap reference circuit having a low sensitivity to temperature and
supplied voltage installs a compensation circuit on a bandgap reference
circuit to substitute a prior art that uses a resistor to match the
circuit startup purpose and solve the problem of startup error caused by
the manufacturing error. The bandgap reference circuit includes a first
amplifier, a second amplifier, and a reference circuit having a plurality
of transistors and a plurality of bipolar junction transistors, and the
bandgap reference circuit is electrically connected to a same supplied
power of which the reference circuit is electrically connected and also
includes a plurality of transistors and a compensation circuit of the
second amplifier, so as to output a stable startup voltage which has a
low sensitivity to the change of temperature and the change of supplied
voltage.