Voltage regulator with gain boosting

A voltage regulator circuit comprising;

• a band gap reference circuit for supplying a reference current which varies as temperature, and a reference voltage which is substantially constant with respect to temperature;
• a first differential amplifier stage comprising first and second transistors emitter coupled to a transistor which provides a mirror current to said first and second transistors proportional to said band gap circuit reference current;
• a second differential amplifier stage comprising first and second transistors emitter coupled to a transistor which provides a mirror current proportional to said reference current to said second differential amplifier stage first and second transistors, a base of said second transistor being connected to receive said reference voltage, said second differential amplifier stage having first and second output connections connected to first and second input connections of said first differential amplifier stage and;
• an output transistor connected to a collector of said first differential amplifier stage first transistor and to a load impedance terminal;
• said first transistor of said second differential amplifier receiving a feedback voltage on its base from said load impedance whereby a regulated voltage is produced across said load impedance.