Abstract: Disclosed are a multi-stage amplifier circuit, a method of operating a multi-stage amplifier circuit, and a device with the multi-stage amplifier circuit. The amplifier circuit technology includes an operational amplifier shared among multiple stages and switching circuitry. The various switching circuitry switches among elements to provide different input signals and different feedback to the shared operational amplifier at the different stages of operation of the amplifier circuit. The various switching circuitry also stores and discharges charge at one or more operational amplifier inputs.

Abstract: An on-chip fuse circuit. The circuit includes a fuse capable of being blown during a programming operation, as well as output logic for determining whether the fuse is blown. A protection circuit is provided for protecting the output logic during programming. An evaluation circuit is provided, for evaluating whether the fuse is blown. The evaluation circuit includes a first current source coupled to the fuse, providing a first predetermined current so as to activate the output logic to read out the condition of the fuse during normal operation, as well as a second current source coupled to the fuse, providing a second predetermined current, substantially less than the first predetermined current, so as to activate the output logic to read out the condition of the fuse during an evaluation mode such that a blown condition is indicated by the output logic only if the resistance of the fuse is substantially greater than that required for the output logic to indicate a blown condition during normal operation.