Semiconductor device having ring oscillator and method of arranging ring oscillator

A semiconductor device comprising:

• a ring oscillator configured to generate a clock signal,
• wherein the ring oscillator includes:
• first to fourth current-controlled delay circuits configured to allow a delay time to be changed depending on a magnitude of sink current;
• a current control circuit configured to determine the magnitude of the sink current and arranged at a center of a square;
• and
• first to fourth differential input single output converters respectively coupled to the first to fourth current-controlled delay circuits,
• wherein the first to fourth differential input single output converters are arranged adjacent or at four sides of the square, respectively.

A memory device comprising:

• a ring oscillator configured to generate a first clock signal;
• a frequency divider configured to output a second clock signal in response to the first clock signal;
• and
• an input/output circuit configured to perform a data input/output operation in synchronization with the second clock signal,
• wherein the ring oscillator includes:
• first to fourth current-controlled delay circuits;
• first to fourth differential input single output converters respectively coupled to the first to fourth current-controlled delay circuits;
• and
• a current control circuit coupled to each of the first to fourth current-controlled delay circuits
• wherein the current control circuit is arranged adjacent or at a center of a square,
• wherein the first to fourth current-controlled delay circuits are arranged adjacent or at four sides of the square, respectively, and
• wherein the first to fourth differential input single output converters are arranged adjacent or at four vertexes of the square, respectively.