Pulse delay circuit with variable delay time

Abstract

Abstract A pulse delay circuit includes a voltage-controlled oscillator (VCO) (4), a phase comparator (7), a low pass filter (8) and a delay line (2). The VCO (4) includes a plurality of first delay elements (50, 51) connected in a loop shape and generates an oscillation output signal according to a control voltage. The phase comparator (7) receives the oscillation output signal and a reference signal, compares the phase of the oscillation output signal and the phase of the reference signal, and generates a comparison signal indicating a phase difference therebetween. The low pass filter (8) receives the comparison signal and generates the control voltage. The delay line (2) includes a plurality of series connected second delay elements (60) for delaying a clock signal and generating a plurality of delay clock signals. Each of the second delay elements (60) is substantially identical to the first delay elements (50, 51). Each of the first and second delay elements (50, 51, 60) sets its own delay time in accordance with the control voltage.

Inventors

• 👤 Masashi Kiyose
• 👤 Toru Akiyama

Bibliographic Details