Delay device and delay control method

A delay control method, comprising:

• disposing a plurality of current-controlled delay groups on a transmission wire, wherein a first current-controlled delay group comprises one first current-controlled delayer and at least one second current-controlled delay group comprises a plurality of second current-controlled delayers;
• providing a control voltage to each of the first current-controlled delayer and the plurality of second current-controlled delayers such that each of the first current-controlled delayer and the plurality of second current-controlled delayers provides a delay;
• providing a plurality of switches and disposing each of the plurality of switches between the transmission wire and each of the plurality of current-controlled delay groups, wherein the plurality of current-controlled delay groups respectively correspond to the plurality of switches, and number of the plurality of switches is equal to number of the plurality of current-controlled delay groups;
• and
• providing a corresponding bit of an enable signal to each switch such that each switch is individually turned on or off.