Abstract: In some examples, a hybrid Chireix-Doherty amplifier comprises a first and second input network, a main amplifier coupled to a first output of the first input network, an auxiliary amplifier coupled to a second output of the second input network, and a combiner network. The combiner network is coupled to a first output of the main amplifier and an output of the auxiliary amplifier. The combiner network includes an output node for coupling to a load, e.g., an antenna of a base station for a radio network. The main amplifier is implemented as an inverse class-F amplifier.

Abstract: A motor control interface system, comprising an interface communication module configured to connect to a wired control port of a rotating electronically controlled motor, such as in an HVAC system, wherein the interface communication module converts a rotating motor speed signal to a wireless signal for receipt by an external monitoring device. The speed output signal comprises a digital square wave signal, and the communication module implements a reciprocal frequency counter method to determine the speed of the motor. The interface communication module wirelessly transmits the motor speed information to a handheld wireless device, such as a smartphone.

Abstract: A radio frequency (RF) meter configured to measure both scalar power and phase information is disclosed. The meter performs a calibration to account for properties of an external coupler connected to the meter inputs. Internal couplers are optionally provided which direct the input signals to a phase detector. The meter is optionally connected to a display and network connections for transmitting the scalar power and phase information.

Abstract: A method of balancing a quadrature modulator includes exciting an in-phase input of the quadrature module and sweeping a phase of an injection signal through a range of degrees, and determining a plurality of in-phase DC components. The method further includes exciting a quadrature input of the quadrature module and sweeping a phase of the injection signal through the range of degrees, and determining a plurality of quadrature DC components. An in-phase sinusoidal equivalent of the plurality of in-phase DC components and a quadrature sinusoidal equivalent of the plurality of quadrature DC components may be determined. At least one correction factor that balances the quadrature modulator may be determined based on a comparison between the in-phase sinusoidal equivalent and the quadrature sinusoidal equivalent.

Abstract: A radio frequency (RF) power generator includes a first switch-mode amplifier that generates a first RF signal in accordance with a first control signal and a second switch-mode amplifier that generates a second RF signal in accordance with a second control signal. The first and second control signals determine a phase difference between the first and second RF signals. An output signal envelope is based on the first and second RF signals and the phase difference. The first control and second control signals alternate phases of the first and second RF signals.

Abstract: A radio frequency (RF) power generator includes a first switch-mode amplifier that generates a first RF signal in accordance with a first control signal and a second switch-mode amplifier that generates a second RF signal in accordance with a second control signal. The first and second control signals determine a phase difference between the first and second RF signals. An output signal envelope is based on the first and second RF signals and the phase difference. The first control and second control signals alternate phases of the first and second RF signals.