Patent ID: 8605845

Claim:
An adaptive phase-shifted synchronization clock generation circuit, comprising: a first current source generating a current which flows through a node to generate a node voltage on the node; an inverse-proportional voltage generator coupled to the node for generating a voltage which is inverse-proportional to the node voltage; a ramp generator receiving a synchronization input signal and generating a ramp signal; a first comparator comparing the inverse-proportional voltage to the ramp signal; and a pulse generator for generating a clock signal according to an output from the first comparator, wherein the inverse-proportional voltage generator comprises: a voltage-to-current converter circuit converting the voltage on the node to a current signal; a first variable resistor which generates a voltage signal as the current signal flows therethrough; a second variable resistor having a resistance capable of being adjusted in synchronization with a resistance of the first variable resistor; an error amplifier comparing a voltage signal generated on the first variable resistor with a reference voltage; a resistance adjustment circuit for synchronously adjusting the resistances of the first and second variable resistor according to the output of the error amplifier; and a second current source generating a current which flows through the second resistor to generate the inverse-proportional voltage.