Abstract: Front-end circuitry for a wireless communication device is disclosed. In some embodiments, the radio frequency (RF) front-end circuitry includes various transceiver chains. The transceiver chains may each include a bulk acoustic wave (BAW) filter. The BAW filter in each of the transceiver chains may each have the same filter design with various exposed external pins, such as input pins, output pins, and ground pins. With respect to the transceiver chains, a different combination of the external pins are hardwired depending on a desired placement of a passband. In this manner, switches and control circuitry for the switches are not needed in order to place the passband. Furthermore, BAW filters with the same filter design can be used in the different transceiver chains, thereby simplifying the manufacturing process of the front-end circuitry.

Abstract: Embodiments of a system include a first transceiver, a first directional coupler, a first antenna, a second directional coupler, a second antenna, a second transceiver, a third transceiver, and a third directional coupler. The first directional coupler is connected to the first transceiver. The first antenna is connected to the first directional coupler. The second antenna is connected to the second directional coupler. The second transceiver is connected to the second directional coupler. The third transceiver has an antenna port. The third directional coupler is connected to the antenna port of the third transceiver and the other directional couplers. The first directional coupler, the second directional coupler, and the third directional coupler are configured to reduce interference that is incurred between the antenna port of the third transceiver and the first and the second transceivers.

Abstract: A radio frequency (RF) circuit and methods of operating the same are disclosed. The RF circuit includes an acoustic filter, upstream/downstream circuitry, a switch device, and temperature circuitry. The acoustic filter includes a first filter path that includes a first acoustic resonator and a second filter path that includes a second acoustic resonator. The switch device is configured to selectively couple the upstream/downstream circuitry to the first filter path and to the second filter path. The temperature circuitry is configured to measure a measured temperature that is related to a filter temperature of the acoustic filter. To compensate for temperature drift in the acoustic filter, the temperature circuitry is configured to operate the switch device such that the first filter path or the second filter path is selectively coupled depending on the measured temperature.

Abstract: Radio frequency (RF) circuits and method of operating the same are disclosed. In some embodiments, the RF circuit includes an input terminal and an output terminal. A first filter path is connected between the input terminal and the output terminal the first filter path including an piezoelectric filter, a first filter and a second filter, wherein the piezoelectric filter is connected between the first filter and the second filter. The second filter path is connected between the input terminal and the output filter, wherein the second filter path includes a third filter and a fourth filter, wherein both the third filter and the fourth filter are of a second type of filter. The first type of filter is one of either a low pass a high pass type filter. The second type of filter is of another one of the low pass the high pass type filter.

Abstract: Embodiments of an acoustic filter are disclosed. In some embodiments, a bandpass filter is included in a passband signal path, the passband signal path is connected between a first terminal and a second terminal. A first bandstop filter is located in a first stopband signal path, the first stopband signal path connected at the first terminal. Additionally, a second bandstop filter is located in a second stopband signal path, the second stopband signal path is connected at the second terminal.

Abstract: A programmable acoustic filter circuit is provided. Herein, the programmable acoustic filter circuit can be dynamically controlled to toggle between two different passbands, such as different unlicensed national information infrastructure (UNII) bands. The programmable acoustic filter circuit includes an insertion element, a main filter, and a notch circuit. The insertion element is coupled in series with the main filter with very low insertion loss. Specifically, the notch circuit can be dynamically decoupled from the insertion element to thereby cause the main filter to pass a radio frequency (RF) signal in a main passband or be coupled to the insertion element to thereby cause the main filter to pass the RF signal in an alternative passband different from the main passband. As a result, it is possible to flexibly configure the programmable acoustic filter circuit to provide adequate out-of-band rejection with lowest possible insertion loss in various coexisting and concurrent operations.

Abstract: Disclosed is a filter bank die having a first acoustic wave (AW) filter having a first antenna terminal and a first filter terminal, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: The present disclosure relates to a filter architecture, which includes a filter bank with multiple filters, an input switch coupled to an input side of the filter bank, and an output switch coupled to an output side of the filter bank. Each filter is multiplexed with one or more different filters at the input side and the output side of the filter bank. At a given time, the input switch is controlled to connect a first group of the filters to a radio frequency (RF) input terminal, and the output switch is controlled to connect a second group of the filters to an RF output terminal. Herein, the first group and the second group have one filter in common, such that the input switch and the output switch are configured to select one of the filters to operate at the given time.

Abstract: Disclosed is a filter bank die that includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, wherein the first AW filter is configured to have a filter skirt with a slope that spans at least a 100 MHz gap between adjacent passbands, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: Front-end circuitry for a wireless communication device is disclosed. In some embodiments, the radio frequency (RF) front-end circuitry includes various transceiver chains. The transceiver chains may each include a bulk acoustic wave (BAW) filter. The BAW filter in each of the transceiver chains may each have the same filter design with various exposed external pins, such as input pins, output pins, and ground pins. With respect to the transceiver chains, a different combination of the external pins are hardwired depending on a desired placement of a passband. In this manner, switches and control circuitry for the switches are not needed in order to place the passband. Furthermore, BAW filters with the same filter design can be used in the different transceiver chains, thereby simplifying the manufacturing process of the front-end circuitry.

Abstract: Embodiments of a charge pump converter are disclosed. In some embodiments, the charge pump converter includes a first switch, a second switch, a third switch, a first charge storage device, and a second charge storage device. The first charge storage device is connected between the first switch and the second switch. The second charge storage device is connected between the second switch and the third switch. In a charging state, the charge pump converter charges the first charge storage device and the second charge storage device. In a multiplying state, the charge pump converter discharges the first charge storage device and the second charge storage device. The multiplying state allows for the charge pump converter to generate voltage higher than an input voltage.

Abstract: Disclosed is a filter bank module having a substrate, an antenna port terminal, and a filter bank die. The filter bank die is fixed to the substrate and includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: Embodiments of an acoustic filter are disclosed. In some embodiments, a bandpass filter is included in a passband signal path, the passband signal path is connected between a first terminal and a second terminal. A first bandstop filter is located in a first stopband signal path, the first stopband signal path connected at the first terminal. Additionally, a second bandstop filter is located in a second stopband signal path, the second stopband signal path is connected at the second terminal.

Abstract: Disclosed is a filter bank module having a substrate, an antenna port terminal, and a filter bank die. The filter bank die is fixed to the substrate and includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, wherein the first AW filter is configured to pass a first passband and attenuate frequencies outside the first passband, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter, wherein the second AW filter is configured to pass a second passband that is spaced from the first passband to minimize interference between first bandpass and the second bandpass while attenuating frequencies outside the second passband.

Abstract: A programmable acoustic filter circuit is provided. Herein, the programmable acoustic filter circuit can be dynamically controlled to toggle between two different passbands, such as different unlicensed national information infrastructure (UNII) bands. The programmable acoustic filter circuit includes an insertion element, a main filter, and a notch circuit. The insertion element is coupled in series with the main filter with very low insertion loss. Specifically, the notch circuit can be dynamically decoupled from the insertion element to thereby cause the main filter to pass a radio frequency (RF) signal in a main passband or be coupled to the insertion element to thereby cause the main filter to pass the RF signal in an alternative passband different from the main passband. As a result, it is possible to flexibly configure the programmable acoustic filter circuit to provide adequate out-of-band rejection with lowest possible insertion loss in various coexisting and concurrent operations.

Abstract: Disclosed is a filter bank die that includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, wherein the first AW filter is configured to have a filter skirt with a slope that spans at least a 100 MHz gap between adjacent passbands, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: Disclosed is a filter bank die having a first acoustic wave (AW) filter having a first antenna terminal and a first filter terminal, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: Disclosed is a filter bank module having a substrate, an antenna port terminal, and a filter bank die. The filter bank die is fixed to the substrate and includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.

Abstract: Disclosed is a filter bank module having a substrate, an antenna port terminal, and a filter bank die. The filter bank die is fixed to the substrate and includes a first acoustic wave (AW) filter having a first antenna terminal coupled to the antenna port terminal and a first filter terminal, wherein the first AW filter is configured to pass a first passband and attenuate frequencies outside the first passband, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter, wherein the second AW filter is configured to pass a second passband that is spaced from the first passband to minimize interference between first bandpass and the second bandpass while attenuating frequencies outside the second passband.

Abstract: Communications receivers and devices are disclosed. A communications receiver includes a low noise amplifier; a multi-band transmit blocking filter having a first port connected to an output of the low noise amplifier, and an RF analog-to-digital converter having an input connected to a second port of the multi-band transmit blocking filter. The multi-band transmit filter passes the receive frequencies of a group of two or more LTE bands, where a first receive frequency range of a first band in the group and a second receive frequency range of a second band in the group are disjoint and not subsets of a receive frequency range of a third band in the group, and attenuates the transmit frequencies of at least some bands in the group by at least twenty dB.