One example includes a device that is comprised of a pre-power amplifier, a power amplifier, a signal path, and a dynamic bias circuit. The pre-power amplifier amplifies an input signal and outputs a first amplified signal. The power amplifier receives the first amplified signal and amplifies the first amplified signal based on a dynamic bias signal to produce a second amplified signal at an output thereof. The signal path is coupled between an output of the pre-power amplifier and an input of the power amplifier. The dynamic bias circuit monitors the first amplified signal, generates the dynamic bias signal, and outputs the dynamic bias into the signal path.

A digital isolator device which includes a first input buffer configured to receive a first differential signal from a transmitter and to provide a second differential signal, the first differential signal being characterized by a first magnitude, the second differential signal being characterized by a second magnitude, the first magnitude being greater than the second magnitude. The device also includes a second input buffer configured to receive a third differential signal from the transmitter and to provide a fourth differential signal, the second input buffer being coupled to the second ground terminal. The device also includes a common-mode circuit coupled to the second differential signal and the fourth differential signal, the common-mode circuit being configured to reduce a common-mode transient voltage, the common-mode transient voltage being associated with a voltage differential between the first ground terminal and the second ground terminal.

An asymmetrical power amplifier circuit is provided. The asymmetrical power amplifier circuit includes a carrier amplifier and a peak amplifier. The carrier amplifier is always active to amplify a radio frequency (RF) to a carrier output power, while the peak amplifier is only active to amplify the RF signal to a peak output power when a time-variant output power of the RF signal is higher than a predefined power threshold. The RF signal in the carrier output power is summed with the RF signal in the peak output power to thereby output the amplified RF signal in the time-variant output power. Unlike a conventional symmetrical power amplifier, the carrier output power and the peak output power are different at a peak of the time-variant output power. As such, the carrier amplifier and the peak amplifier can both operate with optimal efficiency based on a same modulated voltage.

An isolator includes a first insulating portion, a first electrode provided in the first insulating portion, a second insulating portion provided on the first insulating portion and the first electrode, a third insulating portion provided on the second insulating portion, and a second electrode provided in the third insulating portion. The second insulating portion includes a plurality of first voids and a second void. The plurality of first voids are arranged in a first direction parallel to an interface between the first insulating portion and the second insulating portion. At least one of the first voids is provided under the second void.

One example includes a device that is comprised of a pre-power amplifier, a power amplifier, a signal path, and a dynamic bias circuit. The pre-power amplifier amplifies an input signal and outputs a first amplified signal. The power amplifier receives the first amplified signal and amplifies the first amplified signal based on a dynamic bias signal to produce a second amplified signal at an output thereof. The signal path is coupled between an output of the pre-power amplifier and an input of the power amplifier. The dynamic bias circuit monitors the first amplified signal, generates the dynamic bias signal, and outputs the dynamic bias into the signal path.

One example includes a device that is comprised of a pre-power amplifier, a power amplifier, a signal path, and a dynamic bias circuit. The pre-power amplifier amplifies an input signal and outputs a first amplified signal. The power amplifier receives the first amplified signal and amplifies the first amplified signal based on a dynamic bias signal to produce a second amplified signal at an output thereof. The signal path is coupled between an output of the pre-power amplifier and an input of the power amplifier. The dynamic bias circuit monitors the first amplified signal, generates the dynamic bias signal, and outputs the dynamic bias into the signal path.

An isolator includes a first insulating portion, a first electrode provided in the first insulating portion, a second insulating portion provided on the first insulating portion and the first electrode, a third insulating portion provided on the second insulating portion, and a second electrode provided in the third insulating portion. The second insulating portion includes a plurality of first voids and a second void. The plurality of first voids are arranged in a first direction parallel to an interface between the first insulating portion and the second insulating portion. At least one of the first voids is provided under the second void.

An amplifier includes a first coil coupled to at least one input node. The amplifier further includes second and third coils. A first terminal of the second coil is coupled to a source terminal of a first transistor, while a second terminal of the second coil is coupled to a source terminal of a second transistor. A third coil includes first and second terminals coupled to gate terminals of the first and second transistors, respectively. Responsive to receiving an input signal, the first coil electromagnetically conveys the signal to the second and third coils.

A power efficient (PE) amplifier includes a cascode amplifier, a transistor amplifier, and a voltage supply. The transistor amplifier includes at least one differential pair of transistors and a plurality of transformers having a primary winding and a tapped secondary winding. The secondary winding is connected across emitters or sources of each transistor pair. The tap of each secondary has a current source. The primary windings of the plurality of transformers are connected in series. The transistor bases or gates are alternating current (AC) grounded. The collector or drain terminal pairs are connected in parallel. The voltage supply is low voltage and supplies a current to the cascode amplifier. The PE amplifier further includes a plurality of current sources which provide a total current to the transistor amplifier. The PE amplifier has, among other things, improved power gain, improved reverse isolation, improved power dissipation, and improved peak differential swing.

An amplifier includes a first coil coupled to at least one input node. The amplifier further includes second and third coils. A first terminal of the second coil is coupled to a source terminal of a first transistor, while a second terminal of the second coil is coupled to a source terminal of a second transistor. A third coil includes first and second terminals coupled to gate terminals of the first and second transistors, respectively. Responsive to receiving an input signal, the first coil electromagnetically conveys the signal to the second and third coils.