Method and apparatus for controlling supply voltage of clock and data recovery circuit

Abstract

The present invention relates to a method and apparatus for controlling supply voltage of clock and data recovery circuit. According to an embodiment, there is provided an apparatus for controlling supply voltage of clock and data recovery circuit comprising a frequency lock detector configured to compare a frequency of a recovered clock signal with a frequency of a reference clock signal periodically and output a digital value corresponding to the result determined as that the frequency of recovered clock signal is higher than, lower than, or equal to the frequency of a reference clock signal; a digital counter configured to receive the digital value from the frequency lock detector and convert to a counter value based on the digital value; a digital-to-analog converter configured to receive the counter value from the digital counter and generate analog reference voltage corresponding to the counter value; a DC-DC converter configured to receive the analog reference voltage from the digital-to-analog converter and output supply voltage corresponding to the analog reference voltage; and a clock and data recovery circuit configured to receive the supply voltage from the DC-DC converter and generate the recovered clock signal and recovered digital data from a received digital input signal by using the supply voltage.

Dependencies are inferred from the claim text.