Patent ID: 9065439
Filing Date: 2015-06-23
Classification: G06F,H03K

Abstract:
1. A tuneable buffer circuit for use in a clock tree, comprising: a voltage sensor for sensing a supply voltage; a set of at least two buffers coupled in parallel, each buffer having a grounding circuit for implementing a selectable grounding function; a bypass switch connected in parallel with the at least two buffers; a switching arrangement for switching between different modes of operation in dependence on the sensed supply voltage, wherein in a normal mode one buffer in the at least two buffers is connected into the tuneable buffer circuit; in a first low voltage mode the at least two buffers are connected into the tuneable buffer circuit in parallel without a grounding function; in a second low voltage mode the at least two buffers connected into the tuneable buffer circuit in parallel with grounding function; and in a bypass mode the at least two buffers are bypassed by the bypass switch.