Patent ID: 7221227
Filing Date: 2007-05-22
Classification: H03F,H03K

Abstract:
1. A driver, comprising: a feed-forward circuit path extending from an input stage to an amplification stage to an output stage; a current sensing circuit having an input to sense a current draw of the output stage, and an output that is indicative of the current draw exceeding a threshold; and a feedback control circuit having i) a bias transistor, coupled to a node of the feed-forward circuit path between the input stage and the amplification stage, to bias the feed-forward circuit path toward a first potential, ii) a circuit to disable the input stage, and iii) a common source amplifier with source degeneration having an output coupled to the node of the feed-forward circuit path between the input stage and the amplification stage; wherein the bias transistor, the circuit that disables the input stage, and the common source amplifier are activated when the output of the current sensing circuit is indicative of the current draw exceeding the threshold.