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US 11,146,216 B2Granted
Filter and filtering method
AssigneeRealtek Semiconductor Corp.
InventorsWei-Chen Lin, Hsuan-Yi Su, Chih-Lung Chen
Life of this patent
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Abstract
A filter includes M filter circuits. The M filter circuits are sequentially cascaded from an input terminal to an output terminal, in order to generate an output signal according to an input signal, in which M is a positive integer greater than or equal to 2. The M filter circuits include at least one first filter circuit and at least one second filter circuit. Each of the at least one first filter circuit is set to be an active filter circuit, and each of the at least one second filter circuit is set to be a passive filter circuit.
Claims18
A filter, comprising:
- M filter circuits comprising a first stage filter circuit to an (M)th stage filter circuit sequentially cascaded from an input terminal to an output terminal, in order to generate an output signal according to an input signal, wherein M is a positive integer greater than 2, wherein the M filter circuits comprise:
- at least one first filter circuit comprising the (M)th stage filter circuit and an (M−1)th stage filter circuit set to be active filter circuits, wherein the(M)th stage filter circuit is closest to the output terminal, and a gain of the (M)th stage filter circuit is greater than a gain of the (M−1)th stage filter circuit;
- and
- at least one second filter circuit, wherein each of the at least one second filter circuit is set to be a passive filter circuit.
1 more element
A filtering method, comprising:
- setting each of at least one first filter circuit of M filter circuits to be an active filter circuit, wherein the M filter circuits comprise a first stage filter circuit to an (M)th stage filter circuit sequentially cascaded, wherein the at least one first filter circuit comprises the (M)th stage filter circuit and an (M−1)th stage filter circuit, wherein the(M)th stage filter circuit is closest to an output terminal, and a gain of the (M)th stage filter circuit is greater than a gain of the (M−1)th stage filter circuit;
- setting each of at least one second filter circuit of the M filter circuits to be a passive filter circuit;
- and
- generating an output signal according to an input signal by the M filter circuits,
- wherein the M filter circuits are sequentially cascaded from an input terminal to the output terminal, and M is a positive integer greater than 2.
2 more elements
Dependencies are inferred from the claim text.