Hello,ESPRIT said:The circuitry independent of power supply voltage is because there are two
or more stability bias points.
When power supply voltage is zero,
both circuit bias points are stable, respectively at the time of the stability
after an injection. Therefore, the bias point (after a power supply voltage
injection) which adds and desires a start-up circuit is chosen.
Btrend said:There is always a positive feedback path in the control loop of the
bandgap. If you don't use startup circuit, then probably the circuit
will die away through the positive feedback.
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