Importance

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Abstract

An output stage for a Class-G amplifier includes four current mirrors, (CmpL) powered by a first low voltage supply (VspL), (Cmph) powered by a first high voltage supply (Vsph), (CmmL ) powered by a second low voltage supply (VsmL), and (Cmmh) powered by a second high voltage supply (Vsmh). The outputs of the current mirrors are connected together to form an output of the output stage. A buffer (10), whose input forms an input to the output stage, includes a first transistor (19) and a second transistor (27) connected in an emitter follower configuration, which are used to steer the buffer's output either through the first transistor (19) to a first switch (69) or through the second transistor (27) to a second switch (84). The first switch (69), which is controlled by a first comparator (68) connects a collector of the first transistor (19) to either the input to the first current mirror (CmpL) or the input to said second current mirror (Cmph). The second switch (84), which is controlled by a second comparator (82) connects a collector of the second transistor (27) to either the input to the third current mirror (CmmL) or the input to the fourth current mirror (Cmmh). This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

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First Claim