| 摘要 |
An input interface circuit adapted to both analog and digital signals is provided to avoid having a structure separately processing analog and digital signals for reduction of chip size and manufacturing cost thereof. An input interface circuit adapted to both analog and digital signals includes a reference voltage level generator, a differential amplifier(21), and a feedback circuit. The reference voltage level generator generates a reference voltage level. The differential amplifier takes a non-reversed-phase input and a reversed-phase input. The non-reversed-phase input receives an input signal. The reversed-phase input receives the reference voltage level. The feedback circuit feeds an output signal of the differential amplifier back to the reversed-phase input and includes a switch. The switch controls the feedback of the output signal.
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