A small-sized balance filter includes an unbalanced terminal and two pairs of balanced terminals and has a low signal insertion loss. An unbalanced terminal, a first balanced terminal including first and second terminals, and a second balanced terminal Rx including first and second terminals are provided. An unbalanced-side inductor is provided between the unbalanced terminal and the ground, first balanced-side inductors are provided between the first and second terminals of the first balanced terminal, second balanced-side inductors are provided between the first and second terminals of the second balanced terminal, and the unbalanced-side inductor is electromagnetic-field-coupled to each of the first and second balanced-side inductors.

A circuit with galvanic isolation includes a series of n cascaded transformers including a first transformer and a last transformer in the series. A transmitter is coupled to the primary winding of the first transformer in the series of cascaded transformers, the transmitter being configured for supplying to the primary winding a transmission signal as a function of an input signal. A receiver is coupled to the secondary winding of the last transformer of the series of cascaded transformers and is configured for receiving at the secondary winding a reception signal transmitted over the series of cascaded transformers. A predistortion module is configured for applying to the transmission signal a predistortion including an (n1)-fold integration, where n is the number of cascaded transformers, of a transmission signal that would be supplied to the input of a sole transformer present in a single-transformer solution.

A radio frequency circuit includes an adjustable transformer, a first-stage amplifier, and a second-stage amplifier, the first-stage amplifier is coupled to the second-stage amplifier by using the adjustable transformer, and a bandwidth of the adjustable transformer is adjustable. When the bandwidth of the adjustable transformer is adjusted, an operating frequency band of the radio frequency circuit covers an n258 frequency band and an n257 frequency band, or the n258 frequency band and an n261 frequency band.

The invention provides duplexing apparatus, wireless devices and methods for duplexing signals in which measurements are taken at multiple frequencies across a frequency band of interest, and in which a balancing impedance is controlled as a function of those measurements. Isolation between the RX and TX nodes is enhanced across the frequency band as a result.

A signal isolation control apparatus for controlling duplexing of signals to be transmitted through and received from an antenna. The apparatus includes a transmitter chain tap input for coupling to a transmitter chain. An auxiliary transmitter chain is operably coupled to the transmitter chain tap input for processing a transitory signal tapped from the transmitter chain, the auxiliary transmitter chain including an adaptive filter unit and a balance node output for operably coupling to a balance node of a hybrid junction. The adaptive filter unit has a signal leakage monitoring input for operably coupling to an output node of the hybrid junction. The auxiliary transmitter chain is arranged to process the tapped transitory signal in order to generate and apply an isolation signal at the balance node output for maximising isolation of an output node of the hybrid junction from an input node of the hybrid junction.

A signal reception arrangement includes a receiver circuit having a receiver input configured to be coupled to a secondary winding of a transformer of a first communication channel, a first output for providing a data output signal, and a second output. The receiver circuit is configured to evaluate a signal level at the receiver input and to detect a signal transmission when the signal level reaches a given threshold, and generate a feedback signal dependent on a detection of the signal transmission.

A front-end module in compact printed circuit board (PCB) package. The module comprises a PCB comprising a top surface, the top surface comprising a first portion. The module also comprises a power amplifier block disposed on the PCB, the power amplifier block comprising a power amplifier and an output-matching network (OMN) transformer. The power amplifier is coupled to the first portion of the top surface. The OMN transformer is positioned in the PCB vertically under the power amplifier at a first level below the top surface. The module is provided in a compact package with the power amplifier block in the first portion and other functional blocks comprising a filter block, a switch block, a control block, and a low-noise amplifier block, and being disposed on a remaining area of the PCB, outside of the first portion.

Transmit-receive circuitry for an electronic device capable of wireless communication includes: an antenna input/output, for coupling to an antenna; a transmit path, coupled to the antenna input/output, the transmit path including: a power amplifier, for receiving a transmission signal to be transmitted via the antenna; and a transformer; and a receive path, coupled to the antenna input/output, the receive path including: a low noise amplifier, for receiving a reception signal from the antenna. In a receive mode, the low noise amplifier is configured to receive reception signals via the antenna input/output, and the transmit path is connected to the antenna input/output such that the reception signals experience gain as a result of the transformer in the transmit path.

A front end module configured to provide first and second signals conforming to different standards in similar frequency bands, the front end module including a first input; a second input; a first balun coupled to the first input and the second input; a second balun coupled to the first balun and configured to convert a double ended signal into a single ended signal; a filter section coupled to the second balun and configured to selectively filter one or more components of the single ended signal; and an output coupled to the filter section and configured to receive the single ended signal.

An electronic control device includes: a first input-output terminal and a second input-output terminal through which differential signals are input and output; a transceiver integrated circuit (IC) that transmits and receives the differential signals; a first line that connects the first input-output terminal and the transceiver IC; and a second line that connects the second input-output terminal and the transceiver IC. A first capacitance that is a capacitance between the first line and a ground is at least 80 pF and at most 220 pF, and a second capacitance that is a capacitance between the second line and the ground is at least 80 pF and at most 220 pF.