METHOD FOR CONTROLLING ANALOG BUFFER REDUCING FEED-THROUGH AND GLITCH BY OFFSET REMOVAL CIRCUIT

摘要

PURPOSE: A method for controlling an analog buffer reducing feed-through and glitch by an offset removal circuit is provided to reduce the feed-through and the glitch generated from the analog buffer circuit without reducing an operating speed of the analog buffer circuit. CONSTITUTION: An operation amplifier(Af) receives an input signal through a non-inversion terminal in order to perform a buffer function for the input signal. The second switch(S2) connects or disconnects the non-inversion terminal of the operation amplifier(Af) with a negative terminal of an offset capacitor(Cos) according to a control signal. The third switch(S3) connects or disconnects a node connected with the second switch(S2) and the negative terminal of the offset capacitor(Cos) with an output terminal of the operation amplifier(Af). The first switch(S1) connects or disconnects a node connected with the third switch(S3) and the output terminal of the operation amplifier(Af) with the offset capacitor(Cos). A load capacitor(CL) is connected with the output terminal of the operation amplifier(Af).