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US 12,555,882 B2Granted
Adaptive radio frequency filter with improved linearity
AssigneeThales
InventorsFrancis Chan Wai Po, Vincent Petit, Bruno Louis
Life of this patent
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Abstract
An adaptive radio frequency including an input, an output, at least one fixed passive inductor and at least one variable active inductor connected between the input and the output.
Claims19
An active and adaptive radio frequency filter comprising an input, an output, a primary inter-stage, a secondary inter-stage, and a tertiary inter-stage connected together between the input and the output,
- the primary inter-stage being connected in series with the tertiary inter-stage through the secondary inter-stage,
- the primary inter-stage comprising a first primary fixed passive inductor, a first primary variable inductor and a first primary variable capacitor connected in parallel with the first primary fixed passive inductor,
- the first primary fixed passive inductor and the first primary variable inductor forming a first primary variable composite inductor,
- the secondary inter-stage comprising a secondary variable capacitor and a secondary fixed passive inductor connected in parallel,
- the tertiary inter-stage comprising a first tertiary fixed passive inductor, a first tertiary variable inductor and a first tertiary variable capacitor connected in parallel with the first tertiary fixed passive inductor,
- the first tertiary fixed passive inductor and the first tertiary variable inductor forming a first tertiary variable composite inductor,
- wherein the filter exhibits improved linearity performance, as quantified by a third order intercept point (IIP3), of at least +6 dBm.
4 more elements
An active and adaptive radio frequency filter comprising an input, an output, a primary inter-stage, a secondary inter-stage, and a tertiary inter-stage connected together between the input and the output,
- the primary inter-stage being connected in series with the tertiary inter-stage through the secondary inter-stage,
- the primary inter-stage comprising a first primary fixed passive inductor, a first primary variable inductor and a first primary variable capacitor connected in parallel with the first primary fixed passive inductor,
- the first primary fixed passive inductor and the first primary variable inductor forming a first primary variable composite inductor,
- the secondary inter-stage comprising a secondary variable capacitor and a secondary fixed passive inductor connected in parallel,
- the tertiary inter-stage comprising a first tertiary fixed passive inductor, a first tertiary variable inductor and a first tertiary variable capacitor connected in parallel with the first tertiary fixed passive inductor,
- the first tertiary fixed passive inductor and the first tertiary variable inductor forming a first tertiary variable composite inductor,
- wherein the adaptive radio frequency filter is an active filter,
- wherein the filter includes at least one variable active inductor,
- wherein the at least one variable active inductor includes a gyrator and a variable capacitor connected to the output of the gyrator,
- wherein the gyrator is built from transconductance amplifiers, and
- wherein the filter exhibits improved linearity performance, as quantified by a third order intercept point (IIP3), of at least +6 dBm.
8 more elements
An active and adaptive radio frequency filter comprising an input, an output, a primary inter-stage, a secondary inter-stage, and a tertiary inter-stage connected together between the input and the output,
- the primary inter-stage being connected in series with the tertiary inter-stage through the secondary inter-stage,
- the primary inter-stage comprising a first primary fixed passive inductor, a first primary variable inductor and a first primary variable capacitor connected in parallel with the first primary fixed passive inductor,
- the first primary fixed passive inductor and the first primary variable inductor forming a first primary variable composite inductor,
- the secondary inter-stage comprising a secondary variable capacitor and a secondary fixed passive inductor connected in parallel,
- the tertiary inter-stage comprising a first tertiary fixed passive inductor, a first tertiary variable inductor and a first tertiary variable capacitor connected in parallel with the first tertiary fixed passive inductor,
- the first tertiary fixed passive inductor and the first tertiary variable inductor forming a first tertiary variable composite inductor,
- wherein the adaptive radio frequency filter is an active filter,
- wherein the primary inter-stage comprises a positive input, a negative input, a positive output, and a negative output, and wherein the primary inter-stage further comprises a second primary variable active inductor, the first and the second primary variable active inductors being included in a single primary module, the first primary variable active inductor being connected between the positive input and the positive output of the primary inter-stage, and the second primary variable active inductor being connected between the negative input and the negative output of the primary inter-stage,
- wherein the tertiary inter-stage comprises a positive input, a negative input, a positive output, and a negative output, and wherein the tertiary inter-stage further comprises a second tertiary variable active inductor, the first and the second tertiary variable active inductors being included in a single tertiary module, the first tertiary variable active inductor being connected between the positive input and the positive output of the tertiary inter-stage, and the second tertiary variable active inductor being connected between the negative input and the negative output of the tertiary inter-stage, and
- wherein the filter exhibits improved linearity performance, as quantified by a third order intercept point (IIP3), of at least +6 dBm.
7 more elements
Dependencies are inferred from the claim text.