Patent ID: 7227389
Filing Date: 2007-06-05
Classification: H03F

Abstract:
1. A circuit for compensating for an offset voltage, comprising: a temperature detection unit generating a first current varying with a variation in surrounding temperature; a current transfer unit configured to transfer the first current generated by the temperature detection unit; a current adjustment unit configured to amplify and transfer the transferred first current transferred by the current transfer unit; and an output unit having a first semiconductor device operable to establish the offset voltage of the circuit, the offset voltage varying with a variation in the surrounding temperature and in a second current flowing through the first semiconductor device, and a second semiconductor device operable to generate a third current that is substantially constant regardless of the variation in surrounding temperature, the output unit being capable of adjusting the offset voltage to compensate for temperature variation by adding the current amplified and transferred by the current adjustment unit to the third current generated by the second semiconductor device to adjust the second current flowing through the first semiconductor device.