2 SECOND ORDER LOOP FILTER AND MULTI-ORDER DELTA SIGMA MODULATOR INCLUDING THE SAME

摘要

According to an embodiment of the present invention, a secondary loop filter includes an operational amplifier including a first input terminal, a second input terminal receiving an differential input of the first input terminal, and an output terminal; An inversion circuit for inverting and outputting a signal output from an output terminal of the operational amplifier; A first resistor coupled between the first input terminal and the first node; A second resistor coupled between the output terminal of the operational amplifier and the first node; A third resistor coupled between the first input terminal and the input signal; A first capacitor coupled between the second input terminal and the first node; A second capacitor connected between the output terminal of the operational amplifier and the output terminal of the inverting circuit; And a third capacitor connected between the output terminal of the operational amplifier and the first input terminal, wherein the second input terminal is connected to a ground voltage.