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US 9,851,384 B2Granted
Multi-band impedance detector
AssigneeQUALCOMM Incorporated
InventorAdrianus van Bezooijen
Life of this patent
Estimating the term…
Abstract
An impedance detector includes a sensing circuit with an adjustable impedance. The sensing circuit is coupled to a signal path. Further, an evaluation circuit is coupled to the sensing circuit.
Claims20
An impedance detector, comprising
- a signal path with an input and an output;
- a sensing circuit coupled to the signal path, the sensing circuit having an adjustable impedance Zsense
- an evaluation circuit coupled to an input and an output of the sensing circuit, the evaluation circuit configured to evaluate the interaction between an RF signal propagating in the signal path and the sensing circuit;
- an evaluation filter circuit comprising a plurality of different filters;
- a switching circuit coupled to the evaluation filter circuit and configured to selectably couple one of the different filters between the sensing circuit and the evaluation circuit to enhance frequency selectivity of signals provided to the evaluation circuit from the sensing circuit;
- an adjustable impedance network having an input coupled to the output of the sensing circuit;
- and
- a controller having an input coupled to an output of the evaluation circuit and configured to adjust an impedance of the adjustable impedance network based on the output of the evaluation circuit.
5 more elements
A mobile communication device comprising an impedance detector configured to determine the impedance of a signal path, the impedance detector comprising:
- a signal path with an input and an output;
- a sensing circuit coupled to the signal path, the sensing circuit having an adjustable impedance Zsense;
- an evaluation circuit coupled to an input and an output of the sensing circuit having the adjustable impedance Zsense, the evaluation circuit configured to evaluate the interaction between an RF signal propagating in the signal path and the sensing circuit and to provide a signal representing an evaluation result;
- an evaluation filter circuit comprising a plurality of different filters;
- a switching circuit coupled to the evaluation filter circuit and configured to selectably couple one of the different filters between the sensing circuit and the evaluation circuit to enhance frequency selectivity of signals provided to the evaluation circuit from the sensing circuit;
- an adjustable impedance network having an input coupled to the output of the sensing circuit having the adjustable impedance Zsense;
- and
- a controller having an input coupled to an output of the evaluation circuit and configured to adjust an impedance of the adjustable impedance network in response to the signal representing the evaluation result.
5 more elements
Dependencies are inferred from the claim text.