Input feed-forward technique for class AB amplifier
AssigneeMediatek Inc.
InventorsHung-Chieh Tsai, Yu-Hsin Lin
Life of this patent
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Abstract
An amplifier includes an amplifying stage, a cascoded circuit, an input feed-forward circuit and an output stage. The amplifying stage is arranged receiving a differential input pair to generate an amplified differential input pair. The input feed-forward circuit is coupled to the cascoded circuit, and is arranged for feeding the differential input pair forward to the cascoded circuit. The output stage is coupled to the amplifying stage and the cascoded circuit, and is arranged for generating a differential output pair according to the amplified differential input pair and an output of the cascoded circuit.
Claims20
An amplifier, comprising:
- an amplifying stage, for receiving a differential input pair to generate an amplified differential input pair;
- a first cascoded circuit;
- an input feed-forward circuit, coupled to the first cascoded circuit, for feeding the differential input pair forward to the first cascoded circuit;
- and
- an output stage, coupled to the amplifying stage and the first cascoded circuit, for generating a differential output pair according to the amplified differential input pair and an output of the first cascoded circuit.
A class AB amplifier, comprising:
- an amplifying stage, for receiving a differential input pair to generate an amplified differential input pair;
- a first cascoded circuit;
- an input feed-forward circuit, coupled to the first cascoded circuit, for feeding the differential input pair forward to the first cascoded circuit;
- and
- an output stage, coupled to the amplifying stage and the first cascoded circuit, for generating a differential output pair according to the amplified differential input pair and an output of the first cascoded circuit.
Dependencies are inferred from the claim text.