Patent ID: 6304129
Filing Date: 2001-10-16
Classification: H03F

Abstract:
A biasing circuit for a power transistor, comprising:a correction transistor having a device structure which is substantially the same as a device structure of the power transistor;a circuit for biasing a control terminal of the correction transistor so that operating characteristics of the correction transistor are substantially similar to operating characteristics of the power transistor, an output terminal of the correction transistor being coupled to a control terminal of the power transistor so that a signal appearing on the control terminal of the power transistor compensates for a variation in the operating characteristics of the power transistor;an amplifier circuit having an input connected to the output terminal of the correction transistor and an output coupled to the control terminal of the power transistor; andwherein at least one dimension and at least one current level of the correction transistor are scaled relative to a corresponding at least one dimension and a corresponding at least one current level of the power transistor, respectively.