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US 11,387,801 B1Granted
Adjustable rejection circuit with tunable impedance
AssigneeQorvo US, Inc.
InventorNadim Khlat
Life of this patent
Estimating the term…
Abstract
An adjustable rejection circuit with tunable impedance circuit is disclosed. In particular, a circuit is provided with an impedance tuner configured to match impedances for an antenna. The impedance tuner may include an LC circuit (inductor-capacitor circuit) with one or more elements of the LC circuit being variable. An adjustable rejection circuit may be placed in parallel with the impedance tuner. The adjustable rejection circuit may include a variable negative capacitance element that provides strong attenuation in frequencies of interest.
Claims14
A circuit comprising:
- an input;
- an output;
- an impedance tuner comprising:
- a first variable capacitor having a first end and a second end, the first variable capacitor serially positioned between the input and the output;
- and
- a second variable capacitor coupled to a first node formed by the second end of the first variable capacitor and the output, the second variable capacitor also coupled to a ground;
- and
- an adjustable rejection circuit comprising:
- a variable negative capacitance circuit electrically parallel to the first variable capacitor.
6 more elements
A circuit comprising:
- an input;
- an output;
- an impedance tuner comprising:
- a first inductor coupled to the input;
- a second inductor serially negatively coupled to the input and the output;
- a first variable capacitor coupled to an intermediate node between the first inductor and the second inductor and also coupled to a ground;
- and
- a second variable capacitor coupled to the output;
- and
- an adjustable rejection circuit comprising:
- a variable negative capacitance circuit electrically parallel to the impedance tuner.
8 more elements
Dependencies are inferred from the claim text.