Patent ID: RE40053

Claim:
A delay circuit comprising: a delay part delaying a signal by a delay time which is varied based on a control current; and a control current adjustment circuit adjusting the control current so that the delay time changes linearly based on a variation in a resistance value, wherein the control current adjustment circuit comprises: a first resistance unit generating a first voltage; and a second resistance unit comprising a second variable resistor in which the resistance value of the second variable resistor varies stepwisely or discretely but linearly as a whole so that the control current adjusting circuit controls the control current based on the resistance value of the second variable resistor for generating a second voltage; and wherein the control current adjusting circuit controls the control current based on the first and second voltages; the first resistance unit comprises a fixed resistor and a first variable resistor; and the second resistance unit comprises a the second variable resistor having a resistance value equal to that of the first variable resistor.