INPUT CIRCUIT WITH MIRRORING

摘要

Various aspects are directed to providing an output/state based upon an input value. Consistent with one or more embodiments, an apparatus includes a bias circuit that is connected between power and common rails and includes first and second current paths that provide first and second reference currents. A current-mirroring circuit provides a first mirrored current in response to a voltage input transitioning in a first direction between voltage levels, and a second mirrored current in response to a voltage input transitioning in an opposite direction. A logic circuit operates in a first state based upon the first mirrored current and the first reference current, and operates in a second state based upon the second mirrored current and the second reference current.

主权项

1. An apparatus comprising:
a power rail; a common rail; a set-reset latch configured and arranged to provide first and second output states based upon respective set and reset values presented thereto; a bias circuit connected to the power and common rails and configured and arranged with
a first current path configured and arranged to provide a first reference current, anda second current path configured and arranged to provide a second reference current; a first current-mirroring circuit connected to the power rail and configured and arranged to, in response to a voltage level presented at an input port transitioning in a first direction between voltage levels, provide a first mirrored current and operate the set-reset latch in the first output state based upon the first mirrored current and the first reference current; and a second current-mirroring circuit connected to the common rail and configured and arranged to, in response to a voltage level presented at the input port transitioning in a second direction that is opposite the first direction, provide a second mirrored current and operate the set-reset latch in the second output state based upon the second mirrored current and the second reference current.