Abstract:
An apparatus includes a first path tuned to a first frequency band and a second path tuned to a second frequency band. The apparatus also includes cross-coupled circuitry having a first input coupled to the first path and a second input coupled to the second path and having a first output coupled to the second path and a second output coupled to the first path.
Abstract:
An apparatus includes: a plurality of amplification stages, each stage comprising a cascode transistor; and a bridge circuit coupled between gate terminals of cascode transistors in two adjacent stages of the plurality of amplification stages, the bridge circuit including a plurality of diodes.
Abstract:
A concurrent hybrid matching network is disclosed. In an exemplary embodiment, an apparatus includes a phase shifting coupler having a first terminal connected to an antenna, a second terminal connected to a receive signal path, and third terminal connected to a transmit signal path. The apparatus also includes at least one switch to configured to enable one of the receive signal path and the transmit signal path to communicate with the antenna.
Abstract:
A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.
Abstract:
An apparatus includes a first path tuned to a first frequency band and a second path tuned to a second frequency band. The apparatus also includes cross-coupled circuitry having a first input coupled to the first path and a second input coupled to the second path and having a first output coupled to the second path and a second output coupled to the first path.
Abstract:
A method and apparatus are disclosed for concurrently transmitting and/or receiving two or more communication signals by a wireless device. The communication signals may include signals described by two or more communication protocols, such as Wi-Fi communication signals and BLUETOOTH communication signals. For at least some embodiments, the Wi-Fi communication signals may be within a 2.4 GHz or 5 GHz frequency band. In some embodiments, the apparatus may include a configurable switch unit to couple the Wi-Fi communication signals and/or the BLUETOOTH communication signals to an antenna through a diplexer and a filter.
Abstract:
A method and apparatus are disclosed for transmitting communication signals through a multi-mode power amplifier. For at least some embodiments, a communication signal may be amplified by an amplifier of the multi-mode power amplifier selected based on a desired transmit output power. The output of the selected amplifier may be coupled through a configurable inductive element to an antenna. The inductive element may be configured as a balun or as an inductive load element based on an operating mode of the multi-mode power amplifier.
Abstract:
The present disclosure includes multiple polarization electromagnetic wave circuits and methods. In one embodiment, sensors are placed along different axes of an antenna. Sensors along an axis produce a differential signal when a wave on the antenna is polarized along the axis of the sensors. Sensors along another axis produce a common mode signal when a wave on the antenna is polarized along a different axis of the sensors. Another aspect of the disclosure includes a network of inductors arranged in a ring between a transceiver and a multiport antenna. Switches may be configured to couple ports of the antenna to ports of the transceiver to transmit and receive different polarizations.
Abstract:
A method includes providing a first local oscillator signal having a first duty cycle to a first mixer unit and providing a second local oscillator signal having a second duty cycle to a second mixer unit. At least one of the first duty cycle or the second duty cycle is greater than fifty percent. A frequency of the first local oscillator signal approximately equals a frequency of the second local oscillator signal. The method may also include generating a modulated output signal based on an output signal of the first mixer unit and based on an output signal of the second mixer unit.
Abstract:
A driver amplifier with asymmetrical T-coil matching network is disclosed. In an exemplary embodiment, an apparatus includes a first inductor configured to receive an input signal at an input terminal and to provide an output signal at an output terminal that is matched to a resistive load. The apparatus also includes a second inductor connected to the first inductor and coupled to the first inductor by a coupling coefficient, the second inductor having a first terminal connected to a supply voltage.