RING OSCILLATOR AND SEMICONDUCTOR DEVICE

摘要

There are provided a ring oscillator having a plurality of delay circuits to be ring-connected. At least one of the plurality of delay circuits has a delay element formed in a layout region including the same layout shape as the layout shape of an SRAM cell, and a path circuit connected in parallel to the delay element. The delay element outputs an output signal to a delay circuit in the next stage within the plurality of delay circuits in response to one of rise transition and fall transition of a signal input to the input terminal of the delay element from a delay circuit in the previous stage within the plurality of delay circuits. The path circuit outputs an output signal to the delay circuit in the next stage in response to the transition other than the one transition.

主权项

1. A ring oscillator comprising a plurality of delay circuits to be ring-connected, wherein
at least one of the plurality of delay circuits includes a delay element formed in a layout region including the same layout shape as the layout shape of an SRAM cell, and a path circuit connected in parallel to the delay element, the delay element outputs an output signal to a delay circuit in the next stage within the plurality of delay circuits in response to one of rise transition and fall transition of a signal input to the input terminal of the delay element from a delay circuit in the previous stage within the plurality of delay circuits, and the path circuit outputs an output signal to the delay circuit in the next stage in response to the transition other than the one transition.