Voltage regulator with static gain in reduced open loop

An impedance reduction circuit, comprising:

• an output node;
• a diode having a first terminal connected to a current source and a second terminal connected to a circuit ground;
• and
• a resistive element having a first terminal connected to the output node and a second terminal connected to the first terminal of the diode.

A voltage regulator, comprising:

• an operational amplifier having a non-inverting input terminal connected to a reference voltage and an inverting input terminal connected to an output terminal of the regulator;
• a power switch having a first conduction terminal connected to a supply voltage, a second conduction terminal connected to the output terminal of the regulator, and a control terminal coupled to an output terminal of the operational amplifier;
• filtering means for smoothing a regulated voltage at the output terminal of the voltage regulator;
• and
• an impedance reduction stage including a diode-connected transistor having a first conduction terminal and a control terminal connected to a current source and a second conduction terminal connected to a circuit ground, and a resistive element having a first terminal connected to the output terminal of the operational amplifier and a second terminal connected to the first conduction terminal of the transistor.