초록 ▼

The variable delay circuit has a delay circuit and a selector. The delay circuit is formed of a plurality of delay stages connected in cascade. The delay circuit receives an input signal at the initial delay stage and respectively outputs a delayed signal which is the input signal delayed, from the

The variable delay circuit has a delay circuit and a selector. The delay circuit is formed of a plurality of delay stages connected in cascade. The delay circuit receives an input signal at the initial delay stage and respectively outputs a delayed signal which is the input signal delayed, from the delay stages. The selector receives the delayed signals and selecting signals respectively corresponding to the delayed signals. The selector selects the delayed signal corresponding to an activated selecting signal and outputs the selected signal as a delayed output signal. The delay stage(s) subsequent to the delay stage outputting the delayed signal selected by the selector is/are inactivated. Not operating unnecessary delay stages can prevent wasteful power consumption.

대표청구항 ▼

1. A variable delay circuit comprising:a plurality of delay stages, connected in cascade, receiving selecting signals for selecting one of the delay stages, the delay stages outputting delay signals having different delay values, each delay stage receiving a corresponding one of the selecting signal

1. A variable delay circuit comprising:a plurality of delay stages, connected in cascade, receiving selecting signals for selecting one of the delay stages, the delay stages outputting delay signals having different delay values, each delay stage receiving a corresponding one of the selecting signals to output a corresponding one of the delay signals; and a selector receiving the delay signals for selecting and outputting one of the delay signals in response to the selecting signals, wherein said delay stage selected by the corresponding selecting signal outputs a signal having a fixed logic value in response to the corresponding selecting signal.