BIAS CIRCUIT CAPABLE OF MINIMIZING SETTING TIME IN SWITCHED CAPACITOR CIRCUIT AND AMPLIFIER HAVING THE SAME

摘要

PURPOSE: A bias circuit capable of minimizing the setting in a switched capacitor and an amplifier having the same are provided to improve the operating speed by controlling the operating current supplied to the amplifier. CONSTITUTION: An amplifier comprises a plurality of amplifying terminals. A bias circuit section generates the first and second bias voltages so as to increase the transconductance of the amplifying terminals during a slew period and reduces the transconductance of the amplifying terminals during a setting period. The bias circuit section includes a control signal generating device(300) which generates a switch control signal in response to a clock signal applied from an exterior, the first bias generating circuit section which generates the first bias voltage so as to increase the transconductance of the amplifying terminal and the second bias generating circuit section which generates the second bias voltage so as to reduce the transconductance of the amplifying terminal during the slew period.