Patent ID: 8072274

Claim:
A differential oscillation circuit including a feedback loop circuit, comprising: delay circuits, cascade-connected one after another on the feedback loop circuit, each delay circuit configured to delay paired differential input signals which the delay circuit receives, and to output the delayed differential signals as paired differential output signals; an oscillation activation detector circuit configured to detect whether the oscillation circuit is in an oscillation activation state or in a stable state, and to output a detection signal indicating a result of the detection, wherein, on a basis of the detection signal outputted from the oscillation activation detector circuit, each of the delay circuits controls output current values of the differential output signals; and an oscillation stop detector circuit configured to detect that the oscillation circuit stops its oscillation, and to output a reset signal, wherein on a basis of the reset signal, the oscillation activation detector circuit outputs a detection result as the detection signal, the detection result indicating that the oscillation circuit is in the oscillation activation state.