Patent ID: 7619456

Claim:
A multi-phase signal generator comprising: a duty control buffer configured to receive a first differential input signal and a second differential input signal, and generate a first differential output signal and a second differential output signal having variable duty ratios based on a control voltage; a first edge combiner configured to generate a first pulse signal based on first edges of the respective first and second differential output signals; a second edge combiner configured to generate a second pulse signal based on second edges of the respective first and second differential output signals; and a control voltage generator configured to generate the control voltage in response to a logic signal obtained by performing a logic operation on the first and second pulse signals, wherein the first pulse signal transits to a first level in response to the first edge of one of the first and second differential output signals, transits to a second level in response to the first edge of the other of the first and second differential output signals, and the second pulse signal transits to the first level in response to the second edge of one of the first and second differential output signals, transits to the second level in response to the second edge of the other of the first and second differential output signals.