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I thought about that too, and accordingly i think that the output resistor is meant to be placed before the zener to limit the current going through it. I also think the zener diode is placed there to limit the output because of the positive feedback; ie so that the output isn't clamped by the...
Hi,
If we look at the circuit as three different parts, things might look a little different. Looking at the output of the circuit i would say that the zener diode and the 100Ohm resistor constitute a current and voltage limitation. The negative input terminal is preceeded by a passive high...
I think the spikes are a natural result of the hard switching from the switch causing a sudden flow of excess charge into and out of the capacitors. One possible solution could be to increase the size of the caps, or to ramp the switching process by putting a filter at the switch.
Re: Difference between Poly cap and transistor used as a cap
The difference is in the capacitance per unit area for both kinds of caps. Also, depending on the process and technology, the variation in the capacitance and parasitic resistance associated could be quite significant depending on...
Re: PSRR of LDO?
Regarding your first question, both the power transistor and the error amplifier are usually connected to the supply. One possible method of increasing the PSRR of the LDO is by adding a capacitor at the output of the power device (where your regulated voltage should be) to...
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