Compensated voltage reference generation circuit and method

摘要

In accordance with an embodiment, a method of compensating for the temperature coefficient of a reference voltage includes generating a reference voltage that varies over temperature. A temperature compensated reference voltage is generated that compensates for a temperature variation in the voltage value of the reference voltage. In accordance with another embodiment, a temperature compensation circuit that compensates for temperature variation of a reference voltage is includes a reference voltage generator circuit having an output. A first impedance branch is coupled to the output of the reference voltage generator circuit and a second impedance branch is coupled to the output of the reference voltage generator circuit. A transconductance generation circuit having a first terminal connected to the first impedance branch and a second terminal connected to the second impedance branch.

主权项

1. A method of compensating for temperature variation of a reference voltage, comprising:
providing a reference voltage, wherein a voltage value of the reference voltage varies over temperature; applying the reference voltage to a first impedance network and to a second impedance network, wherein the first impedance network includes a first impedance element with a first temperature coefficient and the second impedance network includes a second impedance element having a second temperature coefficient, the second temperature coefficient different from the first temperature coefficient, and wherein the first impedance network includes a first node coupled to a first input of a transconductance circuit, and the second impedance network includes a second node and a terminal, the second node coupled to a second input of a transconductance circuit and the terminal coupled to an output of the transconductance circuit; generating a first voltage and a second voltage in response to the reference voltage applied to the first impedance network and to the second impedance network; generating a compensation signal at the output of the transconductance amplifier in response to the first voltage and the second voltage.