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US 10,756,933 B2Granted
Feed-forward filtering device and associated method
AssigneeMediatek Inc.
InventorTai-You Lu
Life of this patent
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Abstract
A filtering device includes a low-pass filter (LPF), a noise estimation circuit and a first combining circuit. The LPF receives and filters a pre-filtering signal to generate an output signal of the filtering device. The noise estimation circuit estimates an estimated noise signal according to the output signal and the pre-filtering signal. The first combining circuit subtracts the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal.
Claims10
A filtering device, comprising:
- a low-pass filter (LPF), arranged to receive and filter a pre-filtering signal from an interconnection node to generate an output signal of the filtering device;
- a feedback circuit, arranged to receive the output signal to generate a feedback signal;
- and
- a resistor circuit, wherein the resistor circuit comprises a voltage divider coupled between an input signal of the filtering device and the feedback signal, and the voltage divider generates the pre-filtering signal at the interconnection node using the input signal and the feedback signal;
- wherein the input signal, the pre-filtering signal and the output signal are voltage signals,
- wherein the voltage divider comprises:
- a first resistor, wherein a first terminal of the first resistor is directly connected to the interconnection node and a second terminal of the first resistor is coupled to the input signal;
- and
- a second resistor, wherein a first terminal of the second resistor is coupled to the interconnection node and a second terminal of the second resistor is directly connected to the feedback signal, and
- wherein the feedback circuit comprises a feedback buffer that generates the feedback signal based on the output signal.
7 more elements
A filtering method, comprising:
- performing a low-pass filtering (LPF) operation upon a pre-filtering signal received from an interconnection node to generate an output signal;
- generating a feedback signal by a feedback buffer based on the output signal;
- and
- using a resistor circuit comprising a voltage divider coupled between an input signal and the feedback signal to divide the input signal with the feedback signal to generate the pre-filtering signal at the interconnection node, wherein the voltage divider generates the pre-filtering signal at the interconnection node, wherein the voltage divider comprises a first resistor, wherein a first terminal of the first resistor is directly connected to the interconnection node and a second terminal of the first resistor is coupled to the input signal, and the resistor circuit comprises a second resistor, wherein a first terminal of the second resistor is coupled to the interconnection node and a second terminal of the second resistor is directly connected to the feedback signal,
- wherein the input signal, the pre-filtering signal and the output signal are voltage signals.
2 more elements
Dependencies are inferred from the claim text.