BIAS VOLTAGE GENERATOR, CLOCK BUFFER INCLUDING THE SAME AND METHOD OF OPERATING CLOCK BUFFER

摘要

A clock buffer includes a reference voltage generator, an amplifier, a current mirror part, a compensator, and a clock part. The reference voltage generator generates and provides a reference voltage. The amplifier generates an amplified voltage based on the reference voltage and a feedback voltage. The current mirror part generates the feedback voltage and a bias voltage based on the amplified voltage and compensation current. The compensator generates the compensation current which is increased as the operation temperature is increased based on the feedback voltage. The clock part buffers an input clock and generates an output clock based on the bias voltage. A current mode logic (CML) buffer increases a clock delay as the operation temperature is increased and decreases the clock delay as the bias voltage is increased. Therefore, the present invention increases the bias voltage as the operation temperature is increased, thereby improving clock delay sensitivity according to the operation temperature of the CML buffer.