Bias generation circuit and buffer circuit including the same

A bias generation circuit comprising:

• a control unit configured to generate two or more control signals in response to frequency information;
• a reference voltage generation unit configured to generate a first reference voltage and a second reference voltage;
• an amplification section configured to compare the first reference voltage and the second reference voltage with a feedback voltage and configured to output a result as a comparison signal;
• a feedback voltage adjustment section configured to, in response to a first control signal, among the two or more control signals, adjust a slope of the feedback voltage relative to a change in temperature;
• and
• an output section configured to adjust a first current amount according to the comparison signal and configured to output a voltage corresponding to the first current amount as a bias voltage,
• wherein the reference voltage generation unit comprises:
• a first reference voltage generation section configured to generate a first preliminary reference voltage having a level increasing in proportion to an increase in temperature;
• and
• a second reference voltage generation section configured to generate a second preliminary reference voltage having a constant level regardless of a change in temperature.

A bias generation circuit comprising:

• a control unit configured to generate two or more control signals in response to frequency information;
• a reference voltage generation unit configured to generate a first preliminary reference voltage and a second preliminary reference voltage;
• an amplification section configured to compare a first reference voltage and a second reference voltage with a feedback voltage and configured to output a result as a comparison signal;
• a voltage selection section configured to, in response to a first control signal, among the two or more control signals, selectively output the first preliminary reference voltage and the second preliminary reference voltage as the first reference voltage and the second reference voltage;
• a feedback voltage adjustment section configured to, in response to a second control signal, among the two or more control signals, adjust a slope of the feedback voltage relative to a change in temperature;
• and
• an output section configured to adjust a first current amount according to the comparison signal and configured to output a voltage corresponding to the first current amount as a bias voltage,
• wherein, in response to a third control signal, among the two or more control signals, the amplification section is configured to vary current drivability corresponding to at least one of the first reference voltage and the second reference voltage.

A buffer circuit comprising:

• a buffer unit configured to receive an input signal according to a bias voltage and generate an output signal;
• a reference voltage generation unit configured to generate a first preliminary reference voltage having a level increasing in proportion to an increase in temperature and a second preliminary reference voltage having a constant level regardless of a change in temperature;
• a control unit configured to generate two or more control signals in response to a level of the output signal and frequency information;
• and
• a bias voltage adjustment unit configured to generate the bias voltage in response to at least one of the first preliminary reference voltage and the second preliminary reference voltage and configured to control a level change of the bias voltage in response to the two or more control signals.