Double sampling analog low pass filter

摘要

A double sampling analog low pass filter for converting differential inputs of first and second analog signals into a single-ended output signal. The double sampling analog low pass filter having first and second input terminals and a final output terminal includes a first charging/discharging means including at lest one charge storing means, and for charging and/or discharging the charge storing means in response to at least one control signal on receiving a first analog input signal from the first input terminal and a second charging/discharging means including at least one charge storing means, and for charging and/or discharging the charge storing means in response to at least one control signal on receiving a second analog input signal from the second input terminal. A differential input single-ended output operational amplifier amplifies the difference between outputs from the first and second charging/discharging means. A gain control and pole generating means controls a gain of the differential input single-ended output operational amplifier and generates a pole of a transfer function of the differential input single-ended output operational amplifier.