Patent ID: 6657473
Filing Date: 2003-12-02
Classification: H03K

Abstract:
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 variable resistor in which the resistance of the variable resistor varies stepwisely or discretely but linearly as a whole so that the control current adjusting circuit controls the current based on the resistance value of the 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 second variable resistor having a resistance value equal to that of the first variable resistor.