Reference voltage generating circuits

摘要

A reference voltage generating circuit. A bandgap circuit includes a current mirror circuit and an output circuit. The current mirror circuit generates a first current. The output circuit generates a reference current based on the first current. A compensation circuit is coupled to the bandgap circuit in parallel at a combination node and generates a compensation current. The compensation current is smaller than the reference current. The reference current has a first temperature coefficient and the compensation current has a second temperature coefficient that is inverse to the first temperature coefficient. The reference current and the compensation current are combined at the combination node, such that an absolute value of a temperature coefficient of the reference voltage of the combination node is smaller than an absolute value of the first temperature coefficient and an absolute value of the second temperature coefficient.

主权项

1. A reference voltage generating circuit for generating a reference voltage, comprising:
a bandgap circuit, comprising:
a current mirror circuit, for generating a first current; andan output circuit, for generating a reference current based on the first current; and a compensation circuit, with the bandgap circuit coupled in parallel at a combination node for generating a compensation current, wherein the compensation current is smaller than the reference current, the reference current has a first temperature coefficient and the compensation current has a second temperature coefficient that is inverse to the first temperature coefficient, the reference current and the compensation current are combined at the combination node, such that an absolute value of a temperature coefficient of the reference voltage at the combination node is smaller than an absolute value of the first temperature coefficient and an absolute value of the second temperature coefficient.