Patent ID: 9356618
Filing Date: 2016-05-31
CPC Classification: H03H,H03M

Claim Text:
1. A second order loop filter comprising: an operational amplifier comprising a first input, a second input for receiving a differential input of the first input, and an output; an inverter for inverting a signal output from the output of the operational amplifier, and outputting the inverted signal; a first resistor connected between the first input and a first node; a second resistor connected between the output of the operational amplifier and the first node; a third resistor connected between the first input and an input signal; a first capacitor connected between the second input and the first node; a second capacitor connected between the output of the operational amplifier and an output of the inverter; and a third capacitor connected between the output and the first input of the operational amplifier, wherein the second input is connected to a ground voltage.