Tunable filter
AssigneeHuawei Technologies Co., Ltd.
InventorGiuseppe GRAMEGNA
Life of this patent
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Abstract
A tunable filter is provided. The tunable filter includes: a filter input; a filter output; at least one feedback loop coupled between the filter output and the filter input, where the at least one feedback loop includes at least one tunable feedback capacitance which is configured to tune a cut-off frequency of the tunable filter; and an active element, coupled between the filter input and the filter output and configured to drive the at least one tunable feedback capacitance, the active element having a transfer function with a primary pole and at least one secondary pole, where the active element includes a first stabilization element that is coupled to a first internal node of the active element.
Claims20
A closed loop analogue circuit comprising:
- an input;
- an output;
- at least one feedback loop coupled between the output and the input, wherein the at least one feedback loop comprises at least one tunable feedback capacitance;
- and
- an operational amplifier, coupled between the input and the output, wherein the operational amplifier comprises a first stabilization element that is coupled to a first internal node of the operational amplifier, and the first stabilization element comprises at least one capacitance, or a combination of at least one capacitance and at least one resistor.
A tunable filter comprising:
- a filter input;
- a filter output;
- at least one feedback loop coupled between the filter output and the filter input, wherein the at least one feedback loop comprises at least one tunable feedback capacitance;
- and
- an operational amplifier, coupled between the filter input and the filter output, wherein the operational amplifier comprises a first stabilization element that is coupled to a first internal node of the operational amplifier, and the first stabilization element comprises at least one capacitance, or a combination of at least one capacitance and at least one resistor.
Dependencies are inferred from the claim text.