Abstract: A power amplifier apparatus supporting reverse intermodulation product (rIMD) cancellation is provided. The power amplifier apparatus includes an amplifier circuit configured to amplify and output a radio frequency (RF) signal for transmission via an antenna port. The antenna port may receive a reverse interference signal, which may interfere with the RF signal to create a rIMD(s) that can fall within an RF receive band(s). A reverse coupling circuit is provided in the power amplifier apparatus to generate an interference cancellation signal based on the reverse interference signal. The amplifier circuit is configured to amplify the interference cancellation signal and the RF signal to create an intermodulation product(s) to suppress the rIMD(s) to a determined threshold. By suppressing the rIMD(s) in the power amplifier apparatus, it is possible to support concurrent transmissions and receptions in a number of RF spectrums while in compliance with stringent regulatory spurious emissions (SEM) requirements.

Abstract: A microelectromechanical systems (MEMS) switch die having an N number of radio frequency (RF) MEMS switches, each having a anchored beam with a switch contact, a gate, and a terminal contact is disclosed. Also included is a MEMS-based decoder having logic gates comprised of logic MEMS switches that are configured to decode the coded signals to determine which of the N number of RF MEMS switches to open and close, apply a higher level gate voltage to each gate of the RF MEMS switches determined to be closed, wherein the higher gate voltage electrostatically pulls the anchored beam and brings the switch contact into electrical contact with the terminal contact, and apply a lower gate voltage to each gate of the RF MEMS switches to be opened, wherein the lower gate voltage releases the anchored beam and allows the switch contact to break electrical contact with the terminal contact.

Abstract: Embodiments of radio frequency (RF) filtering circuitry are disclosed. In one embodiment, the RF filtering circuitry includes a first port, a second port, a first RF filter path, and a second RF filter path. The first RF filter path is connected between the first port and the second port and includes at least a pair of weakly coupled resonators. The weakly coupled resonators are configured such that a first transfer response between the first port and the second port defines a first passband. The second RF filter path is coupled to the first RF filter path and is configured such that the first transfer response between the first port and the second port defines a stopband adjacent to the first passband without substantially increasing ripple variation of the first passband defined by the first transfer response.

Abstract: Radio frequency (RF) amplifier circuitry includes an input node, an output node, an amplifier, and bootstrap circuitry. The amplifier includes a control node coupled to the input node, a first amplifier node coupled to the output node, and a second amplifier node coupled to a fixed potential. The amplifier is configured to receive an input signal having a first frequency at the control node and change an impedance between the first amplifier node and the second amplifier node based on the input signal. The bootstrap circuitry is coupled between the control node and the second amplifier node. The bootstrap circuitry is configured to provide a low impedance path between the control node and the second amplifier node for signals having a second frequency that is equal to about twice the first frequency and provide a high impedance path for signals having a frequency outside the second frequency.

Abstract: Radio frequency (RF) amplifier circuitry includes an input node, an output node, an amplifier, and bootstrap circuitry. The amplifier includes a control node coupled to the input node, a first amplifier node coupled to the output node, and a second amplifier node coupled to a fixed potential. The amplifier is configured to receive an input signal having a first frequency at the control node and change an impedance between the first amplifier node and the second amplifier node based on the input signal. The bootstrap circuitry is coupled between the control node and the second amplifier node. The bootstrap circuitry is configured to provide a low impedance path between the control node and the second amplifier node for signals having a second frequency that is equal to about twice the first frequency and provide a high impedance path for signals having a frequency outside the second frequency.

Abstract: A microelectromechanical systems (MEMS) switch die having an N number of radio frequency (RF) MEMS switches, each having a anchored beam with a switch contact, a gate, and a terminal contact is disclosed. Also included is a MEMS-based decoder having logic gates comprised of logic MEMS switches that are configured to decode the coded signals to determine which of the N number of RF MEMS switches to open and close, apply a higher level gate voltage to each gate of the RF MEMS switches determined to be closed, wherein the higher gate voltage electrostatically pulls the anchored beam and brings the switch contact into electrical contact with the terminal contact, and apply a lower gate voltage to each gate of the RF MEMS switches to be opened, wherein the lower gate voltage releases the anchored beam and allows the switch contact to break electrical contact with the terminal contact.

Abstract: A stacked field-effect transistor (FET) switch is disclosed. The stacked FET switch has a first FET device stack that is operable in an on-state and in an off-state and is made up of a first plurality of FET devices coupled in series between a first port and a second port, wherein the first FET device stack has a conductance that decreases with increasing voltage between the first port and the second port. The stacked FET switch also includes a second FET device stack that is operable in the on-state and in the off-state and is made up of a second plurality of FET devices coupled in series between the first port and the second port, wherein the second FET device stack has a conductance that increases with increasing voltage between the first port and the second port.

Abstract: A diplexer circuit is provided. The diplexer circuit, which includes a pair of hybrid couplers and a filter circuit, can be configured to support dual-connect (DC) communications on a pair of signal bands separated by a narrower transition band (e.g., ?200 MHz). In examples discussed herein, one of the signal bands is associated with a narrower fractional bandwidth (e.g., <13%) than the other signal band. In this regard, the filter circuit can be opportunistically configured to operate based on the narrower fractional bandwidth. By configuring the filter circuit to operate based on the narrower fractional bandwidth, it is possible to eliminate the need for supporting the wider fractional bandwidth in the diplexer circuit. As a result, it may be possible to implement the diplexer circuit using conventional filters to support DC communications on signal bands associated with a wider fractional bandwidth(s) and separated by a narrower transition band.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.

Abstract: A coupled inductor structure includes a first three-dimensional inductor structure and a second three-dimensional folded inductor structure. At least a portion of the first three-dimensional folded inductor structure is located within a volume bounded by the second three-dimensional folded inductor structure. By nesting the first three-dimensional folded inductor structure within the second three-dimensional folded inductor structure, a variety of coupling factors can be achieved while minimizing the size of the coupled inductor structure.

Abstract: A low-noise amplifier system is disclosed. The low-noise amplifier system includes a low-noise amplifier having an input node and an output node in a receive path and a capacitance equalization network coupled to the output node. Compensation capacitance of the capacitance equalization network sums with non-linear capacitance of the low-noise amplifier such that a total capacitance at the output node varies by no more than ±5% over an output voltage range within voltage headroom limits of the low-noise amplifier for a given supply voltage of the low-noise amplifier. In at least some exemplary embodiments, the compensation capacitance of the capacitance equalization network is a function of output signal voltage at the output node.

Abstract: A power amplifier apparatus supporting reverse intermodulation product (rIMD) cancellation is provided. The power amplifier apparatus includes an amplifier circuit configured to amplify and output a radio frequency (RF) signal for transmission via an antenna port. The antenna port may receive a reverse interference signal, which may interfere with the RF signal to create a rIMD(s) that can fall within an RF receive band(s). A reverse coupling circuit is provided in the power amplifier apparatus to generate an interference cancellation signal based on the reverse interference signal. The amplifier circuit is configured to amplify the interference cancellation signal and the RF signal to create an intermodulation product(s) to suppress the rIMD(s) to a determined threshold. By suppressing the rIMD(s) in the power amplifier apparatus, it is possible to support concurrent transmissions and receptions in a number of RF spectrums while in compliance with stringent regulatory spurious emissions (SEM) requirements.

Abstract: Embodiments of the disclosure relate to reducing intermodulation distortion (IMD) in a radio frequency (RF) circuit. In examples discussed herein, the RF circuit operates in an uplink carrier aggregation (ULCA) mode to transmit an RF uplink signal simultaneously in a first uplink band and a second transmit band. However, nonlinear components in the RF circuit can create an IMD product(s) that can fall into a downlink band of an RF downlink signal, thus impairing a receive filter's ability to receive the RF downlink signal in the downlink band. The receive filter can be opportunistically reconfigured to form an IMD shunt path to attenuate the IMD product. By reconfiguring the receiver filter to form the IMD shunt path, it is possible to suppress the IMD product in the RF uplink signal, thus leading to an improved desense performance in the ULCA mode without incurring additional cost and/or battery life penalty.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) front-end circuit. When a first antenna transmits an RF transmit signal in an RF transmit band, a second antenna may receive the RF transmit signal as an interference signal. The multi-band RF front-end circuit includes multiple receive filters for receiving an RF receive signal in multiple RF receive bands. A selected receive filter among the multiple receive filters is opportunistically reconfigured to help suppress the interference signal. Specifically, a bandpass bandwidth of the selected receive filter is expanded to include at least a portion of the RF spectrum of the interference signal. By doing so, it is possible to shunt the interference signal to a ground through the selected receive filter. As a result, it is possible to reduce an adverse impact of the interference signal to improve RF performance of the multi-band RF front-end circuit.

Abstract: Radio frequency (RF) circuitry is configured to separately route RF transmit signals in different RF frequency bands through one or more non-linear elements, such as switches, in order to avoid intermodulation of the RF transmit signals. One or more filters may be arranged to provide different switching paths in RF front end circuitry to ensure that RF transmit signals are not routed together through a non-linear element, thereby improving the performance of the circuitry.

Abstract: Disclosed is a microelectromechanical systems (MEMS) logic gate with a first logic MEMS switch having a first beam with a first switch contact, a first gate, and a first terminal contact, wherein the first beam is coupled to a fixed higher voltage node. The MEMS logic gate also includes a second logic MEMS switch having a second beam with a second switch contact, a second gate, and a second terminal contact, wherein the second beam is electrically coupled to a fixed lower voltage node. Further included is internal logic gate circuitry having a first input terminal and a first output terminal, wherein the internal logic gate circuitry is electrically coupled between the first terminal contact of the first logic MEMS switch and the second terminal contact of the second logic MEMS switch.

Abstract: A low-noise amplifier system is disclosed. The low-noise amplifier system includes a low-noise amplifier having an input node and an output node in a receive path and a capacitance equalization network coupled to the output node. Compensation capacitance of the capacitance equalization network sums with non-linear capacitance of the low-noise amplifier such that a total capacitance at the output node varies by no more than ±5% over an output voltage range within voltage headroom limits of the low-noise amplifier for a given supply voltage of the low-noise amplifier. In at least some exemplary embodiments, the compensation capacitance of the capacitance equalization network is a function of output signal voltage at the output node.

Abstract: A power amplifier apparatus supporting reverse intermodulation product (rIMD) cancellation is provided. The power amplifier apparatus includes an amplifier circuit configured to amplify and output a radio frequency (RF) signal for transmission via an antenna port. The antenna port may receive a reverse interference signal, which may interfere with the RF signal to create a rIMD(s) that can fall within an RF receive band(s). A reverse coupling circuit is provided in the power amplifier apparatus to generate an interference cancellation signal based on the reverse interference signal. The amplifier circuit is configured to amplify the interference cancellation signal and the RF signal to create an intermodulation product(s) to suppress the rIMD(s) to a determined threshold. By suppressing the rIMD(s) in the power amplifier apparatus, it is possible to support concurrent transmissions and receptions in a number of RF spectrums while in compliance with stringent regulatory spurious emissions (SEM) requirements.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.