Patent ID: 7642810

Claim:
An input circuit for a semiconductor integrated circuit, the input circuit comprising: a first input unit that amplifies a voltage difference between a reference voltage and an input signal, to output a result of the amplification as a first signal; a second input unit that further amplifies the first signal to output a result of the amplification as an output signal, wherein the first input unit receives a compensated bias signal and the compensated bias signal is obtained by comparing an amplified reference voltage and an internal reference voltage, and amplifying a result of the comparison; a first bias signal providing unit that amplifies the reference voltage to a predetermined level on the basis of an operational state biased by the compensated bias signal and outputs a result of the amplification; and a second bias signal providing unit that compares the result provided by the first bias signal providing unit and the internal reference voltage, amplifies the result of the comparison, and generates the compensated bias signal.