Harmonic distortion reduction in continuous time filters

摘要

An integrated circuit (IC) includes first and second circuits. The first circuit is manufactured using a process, has an input and an output, and has a first nonlinearity. The second circuit is manufactured using the process, has a first terminal connected to the output of the first circuit and a second terminal connected to the input of the first circuit, and has a second nonlinearity. The second nonlinearity (i) is equal and opposite to the first nonlinearity and (ii) cancels the first nonlinearity.

主权项

1. An integrated circuit (IC) comprising:
a first circuit that is manufactured using a process, that has an input and an output, and that has a first nonlinearity; and a second circuit that is manufactured using the process, that has a first terminal connected to the output of the first circuit and a second terminal connected to the input of the first circuit, and that has a second nonlinearity, wherein the second nonlinearity (i) is equal and opposite to the first nonlinearity and (ii) cancels the first nonlinearity, and wherein a resistance of the second circuit is a function of an operating parameter of the IC, the IC further comprising: a sensing circuit that senses the operating parameter of the IC; and a control module that is coupled to the sensing circuit and the second circuit and that selects a value of the resistance of the second circuit based on the operating parameter of the IC, wherein the value of the resistance is selected to cancel a predetermined harmonic from the output of the first circuit.