Wireless circuitry is provided that includes a radio-frequency amplifier or mixer, a power detector coupled to an input or an output of the radio-frequency amplifier or mixer, and a transimpedance amplifier coupled to an output of the power detector. The transimpedance amplifier can be implemented as a class A amplifier, a class AB amplifier, or an enhanced class AB amplifier. The power detector can include an input transistor having a gate terminal configured to receive a radio-frequency signal, a bias transistor, and a voltage generator configured to apply a calibration voltage to a gate terminal of the bias transistor to mitigate a direct current (DC) offset associated with the power detector.

Apparatuses and methods for rapid heating a load having magnetic material(s). In some embodiments, the apparatus includes a source of radio frequency (RF) signals and a power management assembly that receives the RF signals and that increases or decreases power of the RF signals. The apparatus additionally includes directional coupler(s) that measure power of the RF signals received from the power management assembly and power of the RF signals reflected from the load to the at least one directional coupler. The apparatus further includes a control assembly operable to receive the measured powers, determine a temperature of the load based on the measured powers, and send one or more control signals to the power management assembly instructing the power management assembly to increase or decrease power of the RF signals received from the source of RF signals to maintain the determined temperature of the load at a predetermined temperature.

Apparatuses and methods for rapid heating a load having magnetic material(s). In some embodiments, the apparatus includes a source of radio frequency (RF) signals and a power management assembly that receives the RF signals and that increases or decreases power of the RF signals. The apparatus additionally includes directional coupler(s) that measure power of the RF signals received from the power management assembly and power of the RF signals reflected from the load to the at least one directional coupler. The apparatus further includes a control assembly operable to receive the measured powers, determine a temperature of the load based on the measured powers, and send one or more control signals to the power management assembly instructing the power management assembly to increase or decrease power of the RF signals received from the source of RF signals to maintain the determined temperature of the load at a predetermined temperature.

Disclosed is a radio frequency (RF) power sensor having measurement uncertainty of less than about 0.3%, which is achieved through the use of cross-correlation for reduction of uncertainty. The power sensor may have multiple couplers, multiple detectors, and at least one analog to digital converter. Also disclosed is a method for operating the power sensor to realize measurement uncertainty of less than about 0.3% due to the uncorrelated nature of the measurements, as well as one or more of identifying the need for power sensor calibration, extending the time between calibrations, and predicting remaining time until calibration is required.

Disclosed is a radio frequency (RF) power sensor having measurement uncertainty of less than about 0.3%, which is achieved through the use of cross-correlation for reduction of uncertainty. The power sensor may have multiple couplers, multiple detectors, and at least one analog to digital converter. Also disclosed is a method for operating the power sensor to realize measurement uncertainty of less than about 0.3% due to the uncorrelated nature of the measurements, as well as one or more of identifying the need for power sensor calibration, extending the time between calibrations, and predicting remaining time until calibration is required.

Wireless circuitry is provided that includes a radio-frequency amplifier or mixer, a power detector coupled to an input or an output of the radio-frequency amplifier or mixer, and a transimpedance amplifier coupled to an output of the power detector. The transimpedance amplifier can be implemented as a class A amplifier, a class AB amplifier, or an enhanced class AB amplifier. The power detector can include an input transistor having a gate terminal configured to receive a radio-frequency signal, a bias transistor, and a voltage generator configured to apply a calibration voltage to a gate terminal of the bias transistor to mitigate a direct current (DC) offset associated with the power detector.

Wireless circuitry is provided that includes a radio-frequency amplifier or mixer, a power detector coupled to an input or an output of the radio-frequency amplifier or mixer, and a transimpedance amplifier coupled to an output of the power detector. The transimpedance amplifier can be implemented as a class A amplifier, a class AB amplifier, or an enhanced class AB amplifier. The power detector can include an input transistor having a gate terminal configured to receive a radio-frequency signal, a bias transistor, and a voltage generator configured to apply a calibration voltage to a gate terminal of the bias transistor to mitigate a direct current (DC) offset associated with the power detector.

A method for emulating a reactive source impedance for a generator connected to a load. The method comprises adjusting an output of the generator, wherein, in response to adjustment of the output, a first measured value M1 calculated with respect to a weighted sum of voltage v, current i and derivatives of the voltage v and the current i tends to a first setpoint S1 for M1. The method also includes receiving a second setpoint S2 for a second measured value M2 and adjusting S1 to adjust the second measured value M2 of a conventional measure of generator output towards the second setpoint S2 for M2, wherein holding M1 constant emulates a desired source impedance of the generator.

Disclosed is a channel-selective RF power sensor having a coupler and a channel-selective power measurement circuit. The said coupler is configured to obtain a sample of energy travelling on a main transmission line and provide the sample of energy to the channel-selective power measurement circuit. The sample of energy has a channel of interest. The channel-selective power measurement circuit is configured to measure RF energy information for the channel of interest in the sample of energy. Also disclosed is a method of measuring RF energy information for a channel of interest. The method includes providing a channel-selective RF power sensor and a main transmission line and obtaining a sample of energy from the main transmission line using a coupler of the channel-selective RF power sensor.

Disclosed is a channel-selective RF power sensor having a coupler and a channel-selective power measurement circuit. The said coupler is configured to obtain a sample of energy travelling on a main transmission line and provide the sample of energy to the channel-selective power measurement circuit. The sample of energy has a channel of interest. The channel-selective power measurement circuit is configured to measure RF energy information for the channel of interest in the sample of energy. Also disclosed is a method of measuring RF energy information for a channel of interest. The method includes providing a channel-selective RF power sensor and a main transmission line and obtaining a sample of energy from the main transmission line using a coupler of the channel-selective RF power sensor.