A microelectromechanical resonant circulator device is providing, having a substrate, and at least three electrical ports supported on the substrate. At least three electromechanical resonator elements are connected with associated switch elements and an associated port. The switch elements are operative to provide commutation over time of the electromechanical resonator elements.

A low noise amplifier is provided. The low noise amplifier includes an input port, an output port, an inverter, a plurality of switched-capacitor units and a feedback inductor. The inverter is electrically connected between the input port and the output port. Each of the plural switched-capacitor units is electrically connected with the inverter in parallel and includes a switch and a capacitor connected in series. The feedback inductor is electrically connected with the inverter in parallel.

A tunable filter is described where the frequency response as well as bandwidth and transmission loss characteristics can be dynamically altered, providing improved performance for transceiver front-end tuning applications. The rate of roll-off of the frequency response can be adjusted to improve performance when used in duplexer applications. The tunable filter topology is applicable for both transmit and receive circuits. A method is described where the filter characteristics are adjusted to account for and compensate for the frequency response of the antenna used in a communication system.

A receiver may include a time-interleaved charge sampler comprising a charge sampler switch in series with a charge sampler capacitor. The receiver may also include a current buffer configured to drive the time-interleaved charge sampler.

A near field radio-frequency identification (RFID) probe includes a probe tip comprising a resonant coil configured to communicate with an RFID compatible device at a predetermined resonant frequency. The near field RFID probe further includes a plurality of switch capacitor networks each comprising a capacitor and an RF switch, wherein switching the plurality of switch capacitor networks changes the capacitance of the resonant coil, thereby changing the resonant frequency of the resonant coil. The near field RFID probe further includes a probe control module configured to adjust the resonant frequency of the resonant coil to maintain the predetermined resonant frequency by switching the switch capacitor networks responsive to detecting that the resonant frequency of the resonant coil has deviated from the predetermined resonant frequency.

A low noise amplifier is provided. The low noise amplifier includes an input port, an output port, an inverter, a plurality of switched-capacitor units and a feedback inductor. The inverter is electrically connected between the input port and the output port. Each of the plural switched-capacitor units is electrically connected with the inverter in parallel and includes a switch and a capacitor connected in series. The feedback inductor is electrically connected with the inverter in parallel.

This disclosure describes systems, methods, and apparatus for a digital-to-analog (DAC) converter, that can be part of a variable capacitor and/or a match network. The DAC can include a digital input, an analog output, N contributors (e.g., switched capacitors), and an interconnect topology connecting the N contributors, generating a sum of their contributions (e.g., sum of capacitances), and providing the sum to the analog output. The N contributors can form a sub-binary sequence when their contributions to the sum are ordered by average contribution. Also, the gap size between a maximum contribution of one contributor, and a minimum contribution of a subsequent contributor, is less than D, where D is less than or equal to two time a maximum contribution of the first or smallest of the N contributors.

A variable capacitor bank includes a conductive housing and a port extending through the housing. An electrical bus is disposed within the conductive housing and coupled to the port. The variable capacitor bank further includes capacitor modules disposed within the housing. Each capacitor module includes a module input electrically coupled to the electrical bus and a switched capacitor branch electrically coupled to the module input, the switched capacitor branch including a capacitor and a switch element in series with the capacitor. In certain implementations, one or more of the capacitor modules may include at least one second switched capacitor branch. The capacitor modules may further include an unswitched, or floor, capacitor that provides a minimum or otherwise known capacitance of the capacitor module. Each capacitor module may further be grounded by being electrically coupled to the conductive housing.

The present disclosure relates to a head-wearable hearing device which comprises a magnetic inductance antenna having a predetermined resonance period for receipt of wireless data signals and a switched capacitor DC-DC converter configured for converting a DC input voltage into a higher or lower DC output voltage in accordance with a clock signal. The charge pump circuit is configured to charge an output capacitor by output current pulses where the output current pulses at least comprise first and second consecutive output current pulses having a mutual pulse delay corresponding to substantially one-half of the predetermined resonance period of the magnetic inductance antenna.

A variable capacitor bank includes a conductive housing and a port extending through the housing. An electrical bus is disposed within the conductive housing and coupled to the port. The variable capacitor bank further includes capacitor modules disposed within the housing. Each capacitor module includes a module input electrically coupled to the electrical bus and a switched capacitor branch electrically coupled to the module input, the switched capacitor branch including a capacitor and a switch element in series with the capacitor. In certain implementations, one or more of the capacitor modules may include at least one second switched capacitor branch. The capacitor modules may further include an unswitched, or floor, capacitor that provides a minimum or otherwise known capacitance of the capacitor module. Each capacitor module may further be grounded by being electrically coupled to the conductive housing.