One or more systems, devices and/or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

Systems and methods herein provide for a tunable resonator. In one embodiment, a tunable resonator includes a transmission line comprising at least two inductor segments and a tap between each of the at least two inductor segments. The resonator also includes one less switch than a number of the at least two inductor segments on the transmission line. Each switch is coupled to one of the taps. And, each switch is operable to decouple at least one of the at least two inductor segments in the transmission line by shunting at least a portion of the transmission line to ground to change a resonant frequency of the transmission line.

Systems and methods herein provide for a tunable resonator. In one embodiment, a tunable resonator includes a transmission line comprising at least two inductor segments and a tap between each of the at least two inductor segments. The resonator also includes one less switch than a number of the at least two inductor segments on the transmission line. Each switch is coupled to one of the taps. And, each switch is operable to decouple at least one of the at least two inductor segments in the transmission line by shunting at least a portion of the transmission line to ground to change a resonant frequency of the transmission line.

A reconfigurable microacoustic filter is specified which comprises a ladder-type-like filter topology and a suitably placed adjustable capacitive element.

A reconfigurable microacoustic filter is specified which comprises a ladder-type-like filter topology and a suitably placed adjustable capacitive element.

A diplexer includes a common terminal, first and second terminals, and first and second filters which are electrically connected to the common terminal. The first filter passes a high frequency signal in a first frequency band. The second filter passes a high frequency signal in a second frequency band higher than the first frequency band. Each filter includes an inductor and a capacitor in a dielectric substrate. The first filter includes a first inductor with one end electrically connected to the common terminal, and a first capacitor electrically connected between another end of the first inductor and a ground. An inductance of the first inductor is smaller than an inductance of another inductor included in the first filter. A frequency of an attenuation pole defined by the first inductor and the first capacitor is higher than a frequency of the second frequency band.

A diplexer includes a common terminal, first and second terminals, and first and second filters which are electrically connected to the common terminal. The first filter passes a high frequency signal in a first frequency band. The second filter passes a high frequency signal in a second frequency band higher than the first frequency band. Each filter includes an inductor and a capacitor in a dielectric substrate. The first filter includes a first inductor with one end electrically connected to the common terminal, and a first capacitor electrically connected between another end of the first inductor and a ground. An inductance of the first inductor is smaller than an inductance of another inductor included in the first filter. A frequency of an attenuation pole defined by the first inductor and the first capacitor is higher than a frequency of the second frequency band.

An inverter for wireless power transfer includes a primary inverter connected in series with a first primary inductor. A first primary capacitor is connected in parallel with the first primary inductor and primary inverter. A series-connected second primary capacitor and primary pad inductor are in parallel with the second primary capacitor. The synchronous inverter includes a controller configured to detect a first primary current in the first primary inductor to control switches in the primary inverter to provide a positive primary inverter voltage across the output of the primary inverter in response to detecting a positive first primary current, and control the switches in the primary inverter to provide a negative primary inverter voltage across the output of the primary inverter in response to detecting a negative first primary current.

An inverter for wireless power transfer includes a primary inverter connected in series with a first primary inductor. A first primary capacitor is connected in parallel with the first primary inductor and primary inverter. A series-connected second primary capacitor and primary pad inductor are in parallel with the second primary capacitor. The synchronous inverter includes a controller configured to detect a first primary current in the first primary inductor to control switches in the primary inverter to provide a positive primary inverter voltage across the output of the primary inverter in response to detecting a positive first primary current, and control the switches in the primary inverter to provide a negative primary inverter voltage across the output of the primary inverter in response to detecting a negative first primary current.

A multi-tune filter system and a control system for operating the multi-tune filter system are described herein. The multi-tune filter system is a tunable frequency range filter. Further, the multi-tune filter system is a digitally programmable filter with an adjustable passband between first and second customizable frequency bounds f1, f2.