INTEGRATED CIRCUIT

摘要

An integrated circuit includes a main clock tree, a reference clock trunk, a reference clock buffer and a calibration circuit. The main clock tree transmits a main operation clock to an internal node via serially-coupled buffers to form a local clock at an internal node. The reference clock buffer transmits a main reference clock via the reference clock trunk to form a reference clock at a terminal node. The calibration circuit compares phases of the local clock and the reference clock to accordingly generate a control signal, so the main clock tree can adjust phase of the local clock according to the control signal.

主权项

1. An integrated circuit, comprising:
a main clock tree comprising a plurality of serially-coupled buffers for transmitting a main operation clock to a first internal node, so as to form a first local clock at the first internal node; a reference clock trunk comprising a source node and a first terminal node; a reference clock buffer coupled to the source node, for transmitting a main reference clock to the first terminal node, so as to form a first reference clock at the first terminal node; and a calibration circuit having a first input terminal and a second input terminal respectively coupled to the first internal node and the first terminal node, for comparing phases of the first local clock and the first reference clock and accordingly generating a control signal, such that the main clock tree adjusts phase of the first local clock according to the control signal.