Oscillator and oscillator adjustment method with stepwise delay

Abstract

There are provided the delay coarse adjustment circuit 3, the delay fine adjustment circuit 4, and the inverter circuit 5. The delay coarse adjustment circuit 3 stepwise varies a delay amount based on the delay coarse adjustment signal S11 and supplies the input oscillation signal S12 with a coarse delay. The delay fine adjustment circuit 4 stepwise varies a delay amount based on the delay fine adjustment signal S2 and supplies the input oscillation signal S13 with a fine delay which is smaller than a delay amount supplied by the delay coarse adjustment circuit 3. The inverter circuit 5 inputs the oscillation signal S14 from the delay coarse adjustment circuit 3 or the delay fine adjustment circuit 4. The delay coarse adjustment circuit 3 coarsely adjusts delays. The delay fine adjustment circuit 4 fine adjusts delays. The coarse and fine adjustments provide a precision delay to generate the oscillation output signal S15. The delay coarse adjustment circuit 3, the delay fine adjustment circuit 4, and the inverter circuit 5 are connected in a ring for stepwise controlling an oscillation signal's oscillation frequency.

Dependencies are inferred from the claim text.