Patent ID: 7570107

Claim:
A band-gap reference voltage generator comprising: a first reference current generator including: a unique-voltage generator configured to generate a base-emitter unique voltage having a negative temperature coefficient; a thermal voltage generator configured to generate a thermal voltage having a positive temperature coefficient; and a first driver configured to generate a first reference current in response to a first voltage signal generated by comparison of the unique voltage and the thermal voltage; a second reference current generator including a comparator configured to compare a division voltage of a power supply voltage and the unique voltage, and output a second voltage signal; and a second driver configured to generate a second reference current in response to the second voltage signal, wherein the comparator receives the base-emitter unique voltage as an inverting(−) signal, and receives the division voltage as a non-inverting(+) signal; and a reference voltage generator including: a third driver configured to form a current mirrors in association with each of the first reference current generator and the second reference current generator, respectively, and generate a third reference current and a fourth reference current via said current mirrors; and a current-voltage converter configured to add the third reference current and the fourth reference current, convert the sum of the third reference current and the fourth reference current into a reference voltage, and output the reference voltage; wherein the first reference current generator further includes: a base-emitter unique voltage generator diode-connected to a bipolar transistor, and configured to generate a constant diode voltage when receiving a power-supply voltage; a thermal voltage generator configured to generate a V BE difference between two bipolar transistors, and generate a thermal voltage proportional to a specific constant KT, where K corresponds to Boltzman constant and T corresponds to absolute temperature, when receiving the power-supply voltage; a comparator configured to compare a first output voltage of the base-emitter unique voltage generator with a second output voltage of the thermal voltage generator, amplify a difference between the first output voltage of the base-emitter unique voltage generator and the second output voltage of the thermal voltage generator, and output the amplified difference; a fourth driver configured to transmit the power-supply voltage to the thermal voltage generator in response to the amplified difference signal of the comparator, and generate the first reference current; and a fifth driver configured to transmit the power-supply voltage to the unique-voltage generator in response to the output signal of the comparator, wherein the fourth driver and the fifth driver form a current mirror, and wherein the fifth driver generates a current signal having a multiple relation in association with the first reference current generated by the fourth driver.