Differential amplifier capable of offset compensation of differential output signal and adaptive continuous-time linear equalizer including the same

A continuous-time linear equalizer (CTLE) that equalizes differential input signals and respectively generates differential output signals, the CTLE comprising:

• a CTLE cell comprising input terminals to which the differential input signals are respectively applied and output terminals configured to respectively output the differential output signals;
• a low-pass filter configured to respectively output low-band differential signals obtained by respectively low-pass filtering the differential output signals;
• and
• an error amplifier configured to amplify a difference between the low-band differential signals and output the amplified difference as a control voltage, wherein:
• the CTLE cell comprises:
• a first transistor comprising a first input terminal of the input terminals and a first output terminal of the output terminals;
• a second transistor comprising a second input terminal of the input terminals and a second output terminal of the output terminals;
• and
• an offset compensator configured to adjust a potential difference between a supply voltage source and the second output terminal according to an average of the control voltage.

A continuous-time linear equalizer (CTLE) comprising:

• a low-pass filter configured to apply low-pass filtering to equalized differential signals to generate low-band differential signals;
• an error amplifier configured to amplify a difference between complementary signals of the low-band differential signals to generate an amplified difference;
• and
• a CTLE cell configured to equalize differential input signals to generate the equalized differential signals, the CTLE cell comprising an offset compensator configured to vary a potential between a supply voltage and one complementary signal of the equalized differential signals based on an average value of the amplified difference.