Input receiver circuit having single-to-differential amplifier, and semiconductor device including the same

A semiconductor memory device, comprising:

• a memory cell array configured to operate in response to a word-line enable signal and a column selecting signal;
• a row decoder configured to decode a row address signal to generate the word-line enable signal;
• a column decoder configured to decode a column address signal to generate the column selecting signal;
• and
• an input/output circuit including an input receiver circuit,
• wherein the input receiver circuit includes:
• a first stage amplifier unit configured to amplify a single input signal in a single-to-differential mode to generate a differential output signal, without using a reference voltage;
• and
• a second stage amplifier unit configured to amplify the differential output signal in a differential-to-single mode to generate a single output signal.