Patent ID: 7671675

Claim:
An output limiting circuit for limiting amplitude of output of an operational amplifier for amplifying an input signal so as to generate an output signal, the output limiting circuit comprising: a reference current generating portion for converting a predetermined constant voltage into a reference current by using a first resistor; an upper side clip voltage generating portion for converting the reference current into an upper side clip voltage with respect to a bias voltage of the operational amplifier by using a second resistor; a lower side clip voltage generating portion for converting the reference current into a lower side clip voltage with respect to the bias voltage of the operational amplifier by using a third resistor; and a gain adjusting portion for adjusting a gain of the operational amplifier so that a voltage level of the output signal does not exceed an upper side limit level corresponding to the upper side clip voltage and that the voltage level of the output signal does not exceed a lower side limit level corresponding to the lower side clip voltage.