A high-frequency signal transmission-reception circuit includes a plurality of band pass filter groups each including a plurality of band pass filter pairs; a first switch including a plurality of band pass filter-side terminal groups each including a plurality of band pass filter-side terminals, and an antenna-side terminal group; a plurality of couplers configured to output respective signal strengths of high-frequency signals transmitted on a plurality of transmission paths; and a second switch including an input terminal group electrically connected to the plurality of couplers, and an output terminal configured to output a detection signal output from one of the plurality of couplers. The first switch electrically connects one band pass filter-side terminal in one band pass filter-side terminal group and one antenna-side terminal, and also electrically connects one band pass filter-side terminal in another band pass filter-side terminal group and another antenna-side terminal.

An electronic device provided includes a communication module, an external module, and a signal integration circuit including first to fourth input ports, and first and second output ports. The first input port is for inputting an input signal. The second input port is for inputting a first L1 band signal. The third input port is for inputting a first L5 band signal. The fourth input port is for inputting a second L1 band signal and a second L5 band signal. The first output port selectively outputs a first output signal and a second output signal. The second output port selectively outputs the first L5 band signal and the second L5 band signal. When the fourth input port is not coupled to an external module, the first output port outputs the first output signal, and the second output port outputs the first L5 band signal.

A radio frequency module includes: a power amplifier; an inductor connected to the power amplifier; an external connection terminal that is connected to the power amplifier via the inductor and is configured to receive a power supply voltage from an outside source; a low-noise amplifier; a matching circuit connected to input of the low-noise amplifier; and a module substrate including a first principal surface and a second principal surface on opposite sides of the module substrate. The inductor is disposed on one of the first principal surface and the second principal surface, and the matching circuit is disposed on the other of the first principal surface and the second principal surface.

Power supplies for electronic devices (e.g. medical imaging devices) are disclosed herein. In one embodiment, a switched mode power supply is minimized in size and weight while maintaining efficiency and an artifact-free image using power supply design techniques tailored to increasing the power conversion frequency to be above the desired receive band of an ultrasound imaging system. In another embodiment, a switched mode power supply is minimized in size and weight while maintaining efficiency and an artifact-free image using power supply design techniques tailored to increasing the power conversion frequency to be just below the desired receive band of an ultrasound imaging system causing the third harmonic and possibly the second harmonic to fall just above the desired receive band.

A LNA (low-noise amplifier) includes a matching network configured to provide a three-way coupling between an input node, a matched node, and a source node; a gate capacitor configured to provide AC (alternate current) coupling between the matched node and a gate node; a cascode amplifier configured to receive a gate voltage at the gate node and output an output voltage at an output node in accordance with a source degeneration at the source node; and a load network connected to the output node, wherein the matching network having a shunt inductor and a series inductor that are overlapped in layout to have a strong mutual coupling and a source degenerating inductor that is laid out in a close proximity to the shunt inductor to have a strong mutual coupling

An amplifying circuit comprises: a plurality of first transistors; a second transistor coupled in series with the first transistor; and a compensation capacitor group comprising a plurality of compensation capacitors and a plurality of switches. When the amplifying circuit operates in a first gain mode, a first number of first transistors are turned on and a second number of compensation capacitors are coupled between the first terminal and the second terminal of the first transistor. When the amplifying circuit operates in a second gain mode, a third number of first transistors are turned on and a fourth number of compensation capacitors are coupled between the first terminal and the second terminal of the first transistor. The first number is larger than the third number, and the second number is larger than the fourth number.

An amplifier includes: a high-frequency input terminal; a high-frequency output terminal; a multistage circuit provided between the high-frequency input terminal and the high-frequency output terminal and including two or more amplifiers and connected in series, each amplifier including an input matching circuit, a transistor, and an output matching circuit; a stabilizing circuit provided in at least two of the amplifiers and including a bandpass filter and a resistor connected in parallel; and a band-rejection filter provided between the at least two of amplifiers and eliminating a frequency lower than an operation frequency of the amplifier. The stabilizing circuit and the band-rejection filter are provided between an output terminal of the transistor of the amplifier and the output matching circuit or provided in the output matching circuit. The closer to the high-frequency input terminal the bandpass filter is, the lower a resonance frequency of the bandpass filter is.

A protection circuit and method for protecting driven circuitry against voltage peaks in a radio frequency signal, “V.sub.RF”, past a predetermined voltage level “V.sub.detect”. The protection circuit includes an input for receiving the radio frequency signal. The protection circuit also includes at least one amplification stage coupled to the input. The amplification stage is operable to produce an amplified signal based on V.sub.detect−V.sub.RF. The protection circuit further includes a hold circuit operable to determine, from the amplified signal produced by the amplification stage, whether a peak voltage V.sub.peak of the radio frequency signal exceeds V.sub.detect. The hold circuit is operable to output a first detection value if V.sub.peak exceeds V.sub.detect. The hold circuit is operable to output a second detection value if V.sub.peak does not exceed V.sub.detect. The protection circuit also includes a latch circuit operable to latch the detection value outputted by the hold circuit.

A radio-frequency (RF) splitter is provided. The RF splitter includes a common branch node configured to transfer an RF signal, input from an input port, to at least one of first and second output ports, first and second branch nodes electrically connected between the common branch node and the first and second output ports, first and second series switches configured to control switching operations to electrically connect the common branch node and the first and second branch nodes to each other, first and second inductors electrically connected between the common branch node and the first and second branch nodes, a resistor electrically connected between the first and second branch nodes, and first and second shunt switches configured to control switching operations to electrically connect the first and second branch nodes and the resistor to each other.

A hybrid diode silicon on insulator front end module and related method are provided. The front end module includes a transmit branch that includes a transmit circuit and a receive branch that includes a receive circuit. The receive circuit includes a low noise amplifier, a pin diode including an anode and a cathode; and a switch. The anode of the pin diode is operatively connected to an antenna switch port and an input voltage source. The cathode of the pin diode is operatively connected to a cathode of the switch. Turning on the switch facilitates a drainage of residual electrical current at the pin diode.