Auto balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary winding. The auto-balancing transformer includes a movable to selectively couple primary phases with two or fewer phases of the secondary system.

The present disclosure relates to a concept for a transformer, a transmitter circuit, a semiconductor chip, a semiconductor package, a base station, a mobile device and a method for a radio frequency transmitter. The transformer for a radio frequency transmitter circuit comprises a primary coil and a secondary coils, which are configured to receive an input signal and to provide an output signal, and a ternary coil configured to provide a feedback signal.

An apparatus includes a receiver chain includes an input node and a transmitter chain comprising a tap and output nodes. An auxiliary transmitter chain comprises an auxiliary input node coupled to the tap node, an adaptive filter unit and a signal output coupled to the input node. The filter unit includes an interpolation processor, and an adaptive filter and a coefficient processor coupled to the receiver chain and the adaptive filter. The transmitter chain generates a first waveform comprising a plurality of frequency-separated signals. Contemporaneously, the auxiliary chain applies a second waveform comprising another plurality of frequency-separated signals at the input node. The receiver chain receives a composite waveform comprising a waveform coupled from the output node and the second waveform. The first waveform lacks signals required for determination of coefficients of the filter whose frequencies coincide with the another plurality of signals of the second waveform.

Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.

Systems, methods, and devices for operating in either frequency division duplexing (FDD) or time division duplexing (TDD) for wireless communications using the same electrical balance duplexer (EBD) circuitry in a transceiver device are provided. A series of switches may selectively couple components of the EBD, such as a low noise amplifier (LNA), a power amplifier (PA), and balancing impedance, to ground based on selected operation mode (e.g., FDD or TDD) while reducing insertion loss of the receiver (RX) and transmitter (TX) signals. Tuned matching network blocks for the LNA and PA may be used in addition to the series of switches to provide impedance matching for additional reduction of insertion loss.

An apparatus includes a receiver chain includes an input node and a transmitter chain comprising a tap and output nodes. An auxiliary transmitter chain comprises an auxiliary input node coupled to the tap node, an adaptive filter unit and a signal output coupled to the input node. The filter unit includes an interpolation processor, and an adaptive filter and a coefficient processor coupled to the receiver chain and the adaptive filter. The transmitter chain generates a first waveform comprising a plurality of frequency-separated signals. Contemporaneously, the auxiliary chain applies a second waveform comprising another plurality of frequency-separated signals at the input node. The receiver chain receives a composite waveform comprising a waveform coupled from the output node and the second waveform. The first waveform lacks signals required for determination of coefficients of the filter whose frequencies coincide with the another plurality of signals of the second waveform.

Systems, methods, and devices for operating in either frequency division duplexing (FDD) or time division duplexing (TDD) for wireless communications using the same electrical balance duplexer (EBD) circuitry in a transceiver device are provided. A series of switches may selectively couple components of the EBD, such as a low noise amplifier (LNA), a power amplifier (PA), and balancing impedance, to ground based on selected operation mode (e.g., FDD or TDD) while reducing insertion loss of the receiver (RX) and transmitter (TX) signals. Tuned matching network blocks for the LNA and PA may be used in addition to the series of switches to provide impedance matching for additional reduction of insertion loss.

Systems, methods, and devices for operating in either frequency division duplexing (FDD) or time division duplexing (TDD) for wireless communications using the same electrical balance duplexer (EBD) circuitry in a transceiver device are provided. A series of switches may selectively couple components of the EBD, such as a low noise amplifier (LNA), a power amplifier (PA), and balancing impedance, to ground based on selected operation mode (e.g., FDD or TDD) while reducing insertion loss of the receiver (RX) and transmitter (TX) signals. Tuned matching network blocks for the LNA and PA may be used in addition to the series of switches to provide impedance matching for additional reduction of insertion loss.

A duplexing apparatus comprises a reference of impedance settings and corresponding calibration measurements. A controller is arranged to set a variable impedance to a first impedance setting and transmit a first transmit signal at a first transmit frequency and measure a resulting first signal at an output node of a hybrid circuit. The controller then selects a second impedance setting, transmits a second transmit signal at a second transmit frequency and measures a resulting second signal at the output node. The controller then determines a balancing result using a system of equations associating the first and second measured signals, and first and second calibration measurements from the reference in respect of the first and second impedance settings, respectively. A third impedance setting is retrieved from the reference by reference to the balancing result to provide isolation of an input node from the output node of the hybrid circuit.

Systems, methods, and devices for operating in either frequency division duplexing (FDD) or time division duplexing (TDD) for wireless communications using the same electrical balance duplexer (EBD) circuitry in a transceiver device are provided. A series of switches may selectively couple components of the EBD, such as a low noise amplifier (LNA), a power amplifier (PA), and balancing impedance, to ground based on selected operation mode (e.g., FDD or TDD) while reducing insertion loss of the receiver (RX) and transmitter (TX) signals. Tuned matching network blocks for the LNA and PA may be used in addition to the series of switches to provide impedance matching for additional reduction of insertion loss.