3RD ORDER LOOP FILTER BASED ON SINGLE OPERATIONAL AMPLIFIER

摘要

Disclosed is a loop filter for a data converter in a wireless communication system for improving both an anti-aliasing filtering characteristic and a power consumption characteristic. Such a loop filter comprises: first and third resistors connected to an input terminal in order, fourth and second resistors connected between an inverting output terminal and a ground in order, a first capacitor connected between one end of the first resistor and one end of the fourth resistor, a second capacitor connected between one end of the fourth resistor and an output terminal, a third capacitor connected between one end of the third resistor and the output terminal, and an operational amplifier which includes an inverting terminal connected to the one end of the first resistor and a non-inverting terminal connected to a ground and outputs an amplified response to the output terminal.