Patent ID: 6801075
Filing Date: 2004-10-05
Classification: G05F

Abstract:
An integrated circuit comprising:a supply voltage terminal; an amplifier circuit comprising at least one transistor having a base terminal configured to receive a base current; and a base current compensation circuit coupled to said supply voltage terminal and said amplifier circuit, said base current compensation circuit configured for compensation of losses in said base current of said at least one transistor through injection of a compensation current at a compensation node coupled to said base terminal. wherein said base current compensation circuit a curent mirror circuit and a sampling circuit wherein said current mirror circuit comprises a pair of transistors, with a first transistor of said pair of transistors comprising a diode-connected transistor and a second transistor of said pair of transistors having a collector coupled to said base terminal, wherein said sampling circuit comprises a first sampling component and a second sampling component, said first sampling component comprising a first transistor having a base terminal coupled to said base terminal of said at least one transistor of said amplifier circuit, and an emitter terminal coupled to an emitter terminal of said at least one transistor of said amplifier circuit, and wherein said second sampling component comprises a second transistor having an emitter coupled to a collector of said second transistor of said current mirror circuit, a base coupled to said base terminal of said amplifier circuit, and a collector coupled to a negative supply voltage terminal.