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1. (WO2019049012) VARIABLE PHASE GENERATION AND DETECTION FOR RADIO-FREQUENCY (RF) ABLATION
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CLAIMS

1. A Radio Frequency (RF) ablation system, comprising:

a signal generator configured to generate an RF signal having a given frequency; control circuitry, configured to set phases and amplitudes of a plurality of replicas of the RF signal generated by the signal generator;

a plurality of non-linear amplifiers, configured to amplify the plurality of replicas of the RF signal, and to drive a respective plurality of ablation electrodes in a patient body with the amplified replicas; and

a processor, configured to receive a return signal, comprising a superposition of the replicas sensed by a patch electrode attached to the patient body, and to adaptively adjust the phases and amplitudes of the replicas in response to the return signal, by controlling the control circuitry.

2. The ablation system according to claim 1, wherein the amplifiers comprise Class-D amplifiers.

3. The ablation system according to claim 1, and comprising a plurality of measurement circuits, configured to measure the replicas amplified by the respective plurality of amplifiers, wherein the processor is configured to adjust the phases and the amplitudes of the replicas based on the measured replicas.

4. The ablation system according to claim 1, wherein the control circuitry is configured to adjust one or more of the plurality of amplified replicas within given limits.

5. The ablation system according to claim 1, wherein the control circuitry is configured to maintain one or more crosstalk currents, which flow through the patient body between the ablation electrodes, within given limits.

6. A method for Radio Frequency (RF) ablation, comprising:

generating an RF signal having a given frequency;

amplifying a plurality of replicas of the RF signal, and driving a plurality of ablation electrodes in a patient body with the amplified replicas, using a respective plurality of nonlinear amplifiers;

receiving a return signal, comprising a superposition of the replicas sensed by a patch electrode attached to the patient body; and

adaptively adjusting respective phases and amplitudes of the replicas in response to the return signal.

7. The method according to claim 6, wherein the amplifiers comprise Class-D amplifiers.

8. The method according to claim 6, and comprising measuring the plurality of replicas amplified by the respective plurality of amplifiers, and adjusting the phases and the amplitudes of the replicas based on the measured replicas.

9. The method according to claim 6, wherein adaptively adjusting respective phases and amplitudes comprises adjusting one or more of the amplified replicas within given limits.

10. The method according to claim 6, wherein adaptively adjusting respective phases and amplitudes comprises adjusting one or more crosstalk currents, which flow through the patient body between the ablation electrodes, within given limits.