Voltage regulators with improved power supply rejection using negative impedance

A C-NegC system for adding a negative capacitance across a capacitor of interest without changing an overall capacitance at a signal node, comprising:

• a negative capacitance circuit;
• and
• a positive capacitance element,
• wherein the negative capacitance circuit is connected between the signal node and a first supply rail, and
• wherein the positive capacitance element is connected between the signal node and a second supply rail.

An R-NegR system for adding a negative resistance across a resistor of interest without changing an overall resistance at a signal node, comprising:

• a negative resistance circuit;
• and
• a positive resistance element,
• wherein the negative resistance circuit connected between the signal node and a first supply rail, and
• wherein the positive resistance element connected between the signal node and a second supply rail.